Originally posted by ManUtd I was wondering what your opinion is on the 35 f2 vs the 40 ltd.
I don't own either, but you could search this site and find tons of informed opinions. It depends to some extent on what else you intend to buy. You said two primes and museum shooting. IMO the 40mm be a touch too long, and it's one stop slower than the 35mm. Both are well priced, and both are excellent lenses in their own way.
Another option would be one of the many legacy 28mm 2.8's. I found this an ideal FL for museum shooting. There are a bazillion of them in the used market for not much money if you don't mind manual focus, not so many with AF.
Several people on hiere like the Sigma 28mm 1.8. It would likely be even more suitable than the 35 for shooting in a museum (FL and speed). As far as comparing it to the 35mm, again, you could do a lot of research on this forum.