I'm ready to move to the Nikon FX line. Is the D4 image more nuanced and lively than the D800?

I'm not either, but I'll tell you this. I complained to Nikon about a few things and it's precisely why I am getting my D800 back tomorrow (turn around of about 6 days) even though I am not an NPS user. Sometimes you gotta just be blunt and say that for £2400 these silly issues shouldn't be still with me. When I get it back I am sure it will be plain sailing.

In the UK us folks tend to think of Americans being much more inclined to complain about poor service alot more than us when us British or Scottish just suck it up and don't say anything; and you won't be surprised to hear that I totally agree with that stance that the American's take. For example, up until a few years ago if I had a crap meal at a restaurant I would just suck it up and when they asked how was the meal I'd be like "great, fine" - even if it was dry and tasteless. Now I am honest; if it sucks I tell them (politely of course). You'd be surprised what you get. Since you pay alot of hard earned money eating out these days (and camera's) I demand satisfaction. Like it or not, that's how I do things now and you on a forum ain't gonna change this stance - complainer or not. I think of people who don't speak up as suckers these days! Just like I used to be for these type of things.