I've finally seen the 79X900B in person.
Was very impressed. The store didn't have any 3D content so I'm arranging to see it again with 3D content (they literally just put it on display yesterday).
4k had amazing clarity. But what was good, was that the store assistant put on some normal broadcast content (BBC news in HD), this was shared across loads of TVs, so was somewhat degraded he said. What this really showed, was how the upscaling handled things (and more like the kind of content that will be on the TV when not watching films or Netflix). I was also impressed by it, and even looked at some SD, which obviously looked a lot worse, but still watchable.
I ensured I sat the distance I reckon I'll be sitting from the TV when/if I get it (2 metres, just under 7 feet), and the size seemed perfect.
I did notice the blacks weren't as dark as the 65X900B (they were sitting next to each other). However, it doesn't seem any worse than my NX720 (actually seems better, and CNET highly rated the NX720's black levels back in 2011 http://www.cnet.com/products/sony-bravia-kdl-55nx720/
- although they said 3D was appalling, and I like 3D, so that's why I'm keen to see what it's like on the 79X900B).
Once I've seen the 3D, I think I'll be getting this model if it's good.
For me, the set is going to be wall mounted above a low TV bench (32cm/12.5 inches), and I reckon the TV will be 12cm above that (so 17 inches off the ground). This is to ensure my eye level is right in the middle. I'm hoping the 3D will do well at this height as the vertical angle will be straight on.
Did anyone note improvements with 3D quality when ensuring the vertical angle is straight on?