« on: April 23, 2013, 11:05:10 PM »
Standard CR answer: go for the focal length you need.
If you're serious about the 35L, you should also consider the Sigma 35. Less expensive and slight sharper than the 35L by many accounts. I have the 35L, and it works for me, but if I were to make the decision now, I'd be tempted by the Sigma.
There is a lot of debate over the 50L. Again, I'd suggest you try some the of the f/1.4 offerings before committing to the 50L. It's a lot more expensive, but it does produce wide open. I never had luck with Canon's 50 f/1.4 wider than f/2.8 -- it was sometimes hit but mostly miss. The 50L is a lot more consistent AF-wise and the look is more pleasing, and it does seem geared to portraiture, which is what you'd use it for.
The 50mm focal length is more versatile for me when I'm trying to cover a large focal range (traveling) with the minimum number of lenses while keeping low light versatility (i.e. 16-35/50/70-300). For portraiture, I'd still favor longer focal lengths (50 over the 35) especially if you have the space like most wedding locales, but ultimately it comes down to your shooting style...