Thinking of buying a big 4K TV without spending a fortune? Read this first.
Sharp 70GK4245K 70″ 4K UHD Smart TV – Frameless LED, TiVo Smart Platform with TiVo+ (160+ Free Channels), Freely with No Subscriptions, Dolby Vision & Dolby Atmos, HDMI 2.1, Freeview Live & On Demand
Key Takeaways
- Excellent value, especially in 70-inch form
- Strong SDR picture quality for the price
- Good smart TV experience with TiVo and Freely
- Gaming features exceed expectations
- Sound quality requires an upgrade
If you’re shopping for a new TV right now, you’ve probably noticed something strange. Screen sizes keep getting bigger, prices keep getting lower, and yet you’re left wondering what corners have been cut to make that possible. When you see a 70-inch 4K smart TV selling for well under £500, it’s natural to feel sceptical.
That’s exactly the position the Sharp GK4245K range puts you in.
On paper, it looks almost too good to be true. A huge screen. 4K resolution. Dolby Vision HDR. Modern smart TV software. Gaming features that actually matter. And all of it at prices that undercut most of the competition by a wide margin.
So what’s the catch?
This review is here to answer that question properly. Not with hype, not with brand loyalty, and not with sales language. Instead, we’ll look at what the Sharp GK4245K gets right, where it compromises, and — most importantly — whether it makes sense for you and how you actually watch TV at home.
Sharp GK4245K at a Glance
Before diving into the detail, here’s a quick overview of what the Sharp GK4245K range offers.
Key specifications
Screen sizes: 43in, 50in, 55in, 70in
Resolution: 4K Ultra HD (3,840 x 2,160)
Panel type: VA LCD
Refresh rate: 60Hz
HDR formats: HDR10, HLG, Dolby Vision
Smart platform: TiVo OS with Freely
HDMI ports: 3 (one with eARC)
Freeview Live
Gaming features: VRR, ALLM, 4K/60Hz, 1080p/120Hz (SDR)
Audio: 2 x 10W speakers, Dolby Atmos support
Price and Value: Where the GK4245K Really Grabs Attention
Let’s start with the main reason most people consider this TV: price.
At the time of writing, typical UK pricing looks like this:
- 43-inch: around £200
- 50-inch: around £260
- 55-inch: around £380
| Image | Product | Features | Price |
 | Toshiba UF3F 43 Inch Fire 4K HDR TV | 4K HDR with Dolby Vision | |
 | RCA Roku 50 Inch Smart TV, 50″ 4K Ultra HD TV | Resolution: 4K UHD | |
 | LG 55UA73006LA 55-Inch 4K Ultra HD HDR Smart TV | Resolution: 4K Ultra HD |
That 70-inch model is the real headline grabber. At this price, you’re not just undercutting premium brands — you’re undercutting other budget brands too.
The key question isn’t whether it’s cheap. It clearly is. The real question is whether it still feels like a good TV once it’s in your living room.
Design and Build: Sensible, Functional, and Clearly Budget-Focused
The Sharp GK4245K doesn’t try to pretend it’s something it’s not. From the moment you unbox it, it’s obvious this is a value-led product.
Build quality
The chassis is lightweight and made mostly from plastic. That’s not a criticism — it’s exactly what you’d expect at this price. The benefit is that even the 70-inch model is relatively easy to handle and wall-mount.
However, the back of the TV is fairly bulky, and the overall feel is functional rather than premium.
Stand and placement
One practical point to be aware of: the TV uses wide-set feet rather than a central stand. That means:
- You’ll need a wide TV unit
- Narrow furniture won’t work
- Wall-mounting may be the cleaner option
This isn’t unusual for large TVs, but it’s something worth checking before making a purchase.
Connections
Connectivity is decent but not generous:
- Three HDMI ports (only one supports eARC)
- Optical audio output
- USB ports
- Ethernet and Wi-Fi
You won’t get HDMI 2.1 bandwidth across the board, but for a TV at this price, that’s not a surprise.
Smart TV Experience: TiVo and Freely Make a Strong Combination
Budget TVs often fall down when it comes to smart software. This is one area where the Sharp GK4245K genuinely performs better than expected.
TiVo OS
The TiVo interface is clean, responsive, and easy to navigate. It does a good job of pulling content from multiple streaming services into one place, making it easier to find something to watch without app-hopping.
You get access to:
- Netflix, Prime Video, Disney+, YouTube, BBC iPlayer, ITVX, Channel 4, My5
The only notable omission is a dedicated Apple TV app, although you can work around this with external devices.
Freely integration
Freely adds live and on-demand UK TV over broadband, without needing an aerial. For many households, especially renters or people using wall-mounted TVs, this is genuinely useful.
Combined, TiVo and Freely make the GK4245K feel much more modern than many similarly priced rivals.
Picture Quality: Better Than You’d Expect, With Clear Limits
This is where things get interesting.
The Sharp GK4245K uses a VA LCD panel, which gives it a natural advantage in contrast compared with cheaper IPS alternatives. That decision alone helps it punch above its weight.
SDR performance
Standard dynamic range content is where this TV looks most comfortable.
In the more accurate picture modes:
- Colours look natural rather than oversaturated
- Skin tones appear realistic
- Motion handling is solid for films and TV
- Sharpness is good without artificial edge enhancement
For everyday viewing — Freeview, streaming box sets, YouTube — the GK4245K delivers a picture that most people will be perfectly happy with.
Brightness and contrast
Brightness levels are modest, but consistent. This isn’t a TV designed to fight bright sunlight in a south-facing room. In a typical UK living room, though, it holds up well enough.
Black levels are respectable for the price, thanks to the VA panel, although you may notice:
- Slight clouding in very dark scenes
- Greyer blacks when viewing off-axis
Again, these are expected compromises, not deal-breakers.
HDR Performance: Supported Formats, Limited Impact
The Sharp GK4245K supports HDR10, HLG, and Dolby Vision, which looks impressive on a spec sheet.
In practice, HDR performance is best described as functional rather than transformative.
Dolby Vision
Dolby Vision content benefits from improved tone-mapping, but the panel simply doesn’t have the brightness to deliver the dramatic highlights you’d see on more expensive TVs.
Some Dolby Vision modes also appear overly dark, which can crush shadow detail unless you tweak settings.
Overall HDR impression
- Colours look richer than SDR
- Highlights lack intensity
- Dark scenes can lose fine detail
- Impact is subtle rather than cinematic
HDR is present, and it works, but it won’t be the reason you buy this TV.
Motion Handling: Solid for Films, Acceptable for Sport
With a 60Hz panel, expectations should be realistic.
For films and scripted TV:
- Motion looks natural
- Judder is well controlled
- No obvious processing artefacts
For fast sports:
- Performance is decent, not exceptional
- Fast camera pans can blur slightly
- Acceptable for casual viewing
Again, this aligns with the TV’s price and target audience.
Gaming Performance: Surprisingly Capable for Console Players
If you’re a console gamer, the Sharp GK4245K may surprise you.
Input lag
Input lag sits around 15ms, which is more than good enough for casual and competitive gaming alike.
Supported features
- Auto Low Latency Mode (ALLM)
- Variable Refresh Rate (VRR)
- 4K at 60Hz with HDR
- 1080p at 120Hz (SDR only, via line-doubling)
You won’t get full HDMI 2.1 bandwidth, but for PlayStation 5 and Xbox Series X owners who mostly play at 60Hz, this TV performs well.
Sound Quality: The Weakest Part of the Package
There’s no getting around it. Sound is the GK4245K’s biggest weakness.
Built-in speakers
- Thin and bass-light
- Limited volume without distortion
- Dolby Atmos support adds little in practice
Dialogue is clear enough, but sound lacks weight and presence. For a TV of this size, the audio simply doesn’t fill the room.
Recommendation
If you buy this TV, budget for:
- A basic soundbar
- Or an external speaker system
Even an entry-level soundbar will make a noticeable difference.
Energy Efficiency and Everyday Use
The GK4245K is reasonably efficient for its size, and day-to-day use is straightforward.
Menus are easy to navigate, the remote is simple (if a little flimsy), and setup is quick.
Once configured, the TV stays out of your way — which is exactly what most people want.
Who Is the Sharp GK4245K Actually For?
This TV makes the most sense if:
- You want the biggest screen possible for the money
- You mainly watch TV, films, and streaming content
- You play console games at 60Hz
- You’re happy adding a soundbar
It’s not ideal if:
- You’re a home cinema purist
- You want top-tier HDR performance
- You expect premium build and audio
Final Verdict: Outstanding Value, Sensible Compromises
The Sharp GK4245K doesn’t try to compete with high-end TVs. Instead, it focuses on delivering maximum screen size, solid picture quality, and modern smart features at the lowest possible price.
And in that context, it succeeds.
Yes, the sound is weak. Yes, HDR is limited. Yes, the build feels basic. But none of those flaws overshadow what this TV does well — especially when you consider the price.
If you’re looking for a large, capable 4K TV that doesn’t empty your bank account, the Sharp GK4245K is one of the smartest budget choices available right now.
