By rights, your D7K and D800 have exactly the same demands on the photographer and AF system due to equivalent pixel density of the sensor. And you don't seem to be talking about corner softness or vignetting etc. which can be FX sore points.
I do wonder if we are talking a shutter speed problem here? (which has a corollary of developing ever better handholding technique). I realize I can be a bit of a broken record in my quest for ever higher shutter speeds. But all the same I think higher shutter speeds make a noticeable difference on my keeper rate.
To answer your general question, yes I believe I am happy. I think the 2012 sensors are really providing something additional. I know some people talk "ahhh just another incremental camera" when referring to recent models but I don't share that. I've sacrificed everything I can (and have been planning for this moment for a good couple years now) to get the recent cameras, ejecting older cameras, lenses, committing rainy day funds, working overtime and you name it. We're at a peak right now with the IQ of the D4, D800, D600, D3200, D5200 and other models soon to arrive. Independent sources such as Bill Claff and DxOMark would appear to echo that.