135L for weddings

[roc1]

Ok so I'm looking at this lens for my wedding work and just wondered if anyone uses this and how they find it (whether there are limitations in low light situations in the church etc?). Can't really find anything bad about this lens but would like to hear from anyone who uses this all the time at weddings.

Already have the 35L which I love, and have a Sigma 70-200 so have that area covered, but since getting the 35L I can see how people get addicted to the optical quality!

Thanks