As as D90 owner and now a D600 (arrived today from B&H), I charged up the battery a bit and played with it a few minutes. I felt at home with it.
I took a few iso 1600 shots and definitely looks better than my D90. I checked focus point location and does not look like an issue at although they are bunched together.
The feel in the same is similar but the D600 seems edgier (maybe my D90 is a bit worn it). I have to agree that Canon's hand feel (how you hold in your right hand) is a wee better but not an issue to me. The viewfinder is bright and focus was quite fast.