So I have the canon 50 1.8. I use it some but am not super impressed with it. It's great stopped down but I can get about the same quality with the 24 105 IS. I just recently upgraded to a full frame camera. I've only gotten to do one shoot with the full frame but I'm noticing the 35 2.0 that I used a ton on my crop body isn't the focal length I'm looking for as much on full frame. What I'm trying to figure out is if I should just try messing around with the canon 50 1.8 some more or if it's worth upgrading to the 1.4. I hear lots of complaints about it not being a true usm focus system. It would be nice to have the better aperture blades but if that's the main thing I'm getting it's not worth it. Has anyone been in a similar situation and have some advice? Thanks.