I've used the 1.8 on crop and now I'm using the canon 1.4 FF. It's a bit hard to compare the two since I switched formats, but I will say that I really enjoy the 1.4 and for the money I can't fault it. Build wise I am a bit disappointed. I was expecting it to be inline with the 85 1.8 and 28 1.8 and it simply isn't. Maybe that's not fair since those lenses are more expensive, but the focus ring just isn't nearly as nice and the external movement makes it feel a lot less sturdy