I like the idea of the Sigma 50 F1.4, it sounds like an ok lens. I guess this is where Canon kicks Nikons butt. I'm not a fan of third party lenses. I think i'll skip it for now though and get it later. Unless I change my mind and get it soon.
Actually Canon doesn't kick Nikon's butt when it comes to a 50mm prime. They are all pretty much the same. Decent IQ wide open, gets sharper at f2, not the quickest AF, etc. I had the 50L and I can honestly say I am just as happy if not happier with my Sigma 50 1.4 at 1/3 the price.
Now as far as the 35L, 85L, 851.8, 100 f2, 135L is concerned, you are right. Canon kicks Nikon's butt!

and you are even ok with using f/4. so just wait and see 



