@lucid this is great, thanks for this.Sound bars: Q600C vs Q800C; the 800 is the superior range between the two. The main bar is thicker which means more space for the drivers to develop a deeper richer tone compared to the 600. The sub on the 800 has an 8" driver versus 6.5" with the 600.
I'm puzzled why you wouldn't go for the Q930?
Okay, it's a 2022 model and not a 2023 model, but it comes from a higher range than all the other bars in your list. That means not only does it do 5.1.4 Atmos with proper rear speakers (the others don't, or has them as optional items which makes the whole thing a lot more expensive), but you also get superior tuning (it's tweaked better for sound as part of the design) and there's the room EQ feature and possibly slightly better amplification since rtings mentions less compression at higher volumes vs the 2022 Q800B.
Incidentally, the 2023 Q800C is a fraction better than the Q800B, but still not as good as the Q930B. My advice to you on this is clear: Buy the Q930B while you still can. You'll be kicking yourself you missed the deal once this stock is all sold through.
TVs - Crystal is Samsung's basic range. The 85" version of the CU8000 is a 100Hz/1200Hz set. UK TV is based on our mains frequency which is 50Hz. A TV which is 100Hz is able to draw twice as many pictures per second than one which is 50Hz. (50Hz = 50 pictures per second. 100Hz = 100) This helps with image clarity in fast motion. There's less motion blur. 60Hz and 120Hz comes about because we have a lot of US-sourced streaming content. Their mains frequency is 60Hz, so their base refresh rate is 60Hz too (60 images per second). Their better level sets do 120Hz.
Digital TVs bought in the UK can handle 60Hz too. a 100Hz set will scan at 120Hz as well.
Image processing plays a part with TVs too. Image processing doesn't change the number of images a panel can display per second, but it can do a better job of rendering the incoming image. In this respect the CU7100 has a slight advantage over the 8000 despite only being a 50Hz/60Hz set. The image processing is working more effectively with the 50Hz screen whereas it struggles to keep up with the 100Hz screen. the 7100 is better for gaming (faster response time).
The Achilles Heels with the Crystal sets are a lack of image brightness (too few LEDs behind the screen), and limited or no dimming features.
The brightness issue rears its head when comparing HDR versus standard dynamic range (SDR). The sets are sort of okay on SDR brightness. But there's nothing left in reserve to give the HDR images the extra pop they require to make those Marvel 4K streaming films really zing off the screen. These screens also struggle with the ability to dim all or some of the screen area to enhance the contrast.
I think what's crucifying you here is the drive to get a huge screen. The change in cost between a 75" and an 85" screen is disproportionate to the screen area increase. The 75" CU7100 is £849 at Currys. The 85" version is £1449. The 85" is 28% more screen area, but you're spending over 70% extra to get it.
If it was me, I'd buy a much better TV at 75" rather than stretching the budget too thin just to get 85". I'd give serious thought to the Sony XR75X90K at £1499. This ticks a lot more boxes. It's 100/120Hz, and adds full array local dimming (all the LEDs are behind the screen, and they can be dimmed in segments to enhance the screen contrast. The images are much brighter in both SDR and HDR. The motion processing is excellent compared to the Samsungs. You get far better clarity with fast motion and it's a great TV for gaming (low lag). There's also full support for variable refresh rate (VRR) if your console has that. Finally, Sonys can work with HDR10 and Dolby Vision. Samsungs don't support DV (it's political.) A smaller but far more vibrant screen is more eye-catching than a bigger dull one.
The Sony isn't perfect. Viewing the screen off axis results in the colour losing some impact. This is due to the VA panel and it's a trade-off for the far better contrast that these produce. The alternative would be a TV with an IPS panel (LG mostly) where you get a better viewing angle but the blacks look grey. The Samsungs are likely to use VA panels too, so you're no better off with them as they lose colour saturation too.
So Q930B looks to be your recommendation and gives me rear speakers which kind of sounds awesome! I haven't heard one but based on listening to the HW-Q800C which sounded pretty punch to me in Currys and didn't have rear speakers, are you saying in theory the Q930B should sound the same or better perhaps? its only £629 here : https://www.reliant.co.uk/samsung-hwq930b-black-1000010470
Regarding 85" - I've had to commit to the calling already so that ship has sailed so I would like to still commit to 85"
What do you think? bearing in mind, it's not going to be a TV which will be scrutinised by a professional - just my teenage kids and adults partying and drinking half of the time?