This is the ideal lens for every application. Wide enough for large group shots and long enough for distant subjects or close-ups. The autofocus is very fast on my 7D. I took a picture of a helicopter flying overhead and the autofocus came out at 9/10 frames. Sharpness is also very good. This competes very well with the EF-S 15-85 (almost the same according to DxOMark) and the EF-S 17-55 (only one point less according to DxOMark). The advantage is that you get a much larger range! Sure, indoors in low light, this lens isn't your best friend, but in most situations it will stay on your camera more often.
π· Nikon AF-S NIKKOR 50mm f/1.4G Lens with Auto Focus: Perfect for Nikon DSLR Cameras
76 Review
Nikon 35mm f/1.8G Auto Focus Lens for Nikon DSLR Cameras - Black (Model 2183)
125 Review
Canon EF 50mm f/1.8 II Fixed Lens - Discontinued by Manufacturer
93 Review
Black Canon EF 24-105mm f/4L IS II USM Lens - Model 1380C002
78 Review