If I switched I would miss the primes. I owned two copies 35mm f/2, 85mm f/1.8, and 85mm f/1.4 but sold them in a week. Reasons ranging from unattractive bokeh, not sharp open wide, and loud bang focusing . Bought 35mm f/1.8 DX and like it so far. The Sigma 50mm is probably the best 50mm for Nikon IMHO.
anyone who swtiched over to nikon miss the canon primes? it's been tempting to move from the 5d classic to the d700 with their zooms (i'll be starting with the 24-70mm), but canon 35L, 85L, and 135L are holding me back. but with the higher ISO handling capabilities matched with the F2.8, it seems like the fast primes won't be missed too much. is this what can be expected?