Got my Nikon 1.8 a couple of weeks ago and have been using it exclusively for portraits at f4. I love this lens and I can't believe how sharp it is. I don't know when I would use f1.4 if I ever had it - the DOF would just be too narrow for my use.
Well, I picked up my fastest piece of glass ever yesterday.
50mm f1.4.
So, I decided to see how this one compared to the 50mm f1.8 I already owned.
(I couldn't pass on the 1.4... it was a good deal.)
So, I decided to set up my tripod and try 3 different f stops with each. The photos
are at 1.8, 2.8 and 8.0. I didn't feel like doing anymore. I have been lazy lately.
I forgot to mention these are 100% crops.
Anywho, check the glass out on this thing compared to the 1.8.
The 1.8 and 1.4 are very much on par with each other at higher apertures. In the lower segment the 1.8 has horrible border performance. The 1.4 fairs much better at the borders.
The Nikon has a MUCH better build quality than the canon (talking the 1.8 here). It has sharper centre performance too. The Canon however fairs better on the boarder. I would consider the 1.8 a must in any kit because of the price. The 1.4 is nice, but also costs twice as much.