I can't speak to those two specific questions, as I don't have a V3, but I do have a V1 and V2 - and I would not use the screen in sunlight, I would use the viewfinder with either of these. And both of these are very fast to focus - I don't know the V3 to be faster. But overall ergonomics are FAR better on the V2 than the V1, and from what I've heard, the V3 is also quite good ergonomically with the EVF and grip, less so without those accessories. BTW, you might wish to post this in the Nikon 1 system forum, not the Nikon fixed-lens forum.
My sense is that the IQ is not much better across the different generations, other than the V3 having higher resolution and better noise reduction in JPEG. RAW IQ is basically unchanged across these 3 cameras.