http://www.nikonchat.com/the-nikkor-85mm-f-1-4/

Would it be wise to change into a 50mm f/1.4 Nikkor 85mm F/1.8 one?
prty quality is the same [with the exception of the focal length]? I am 85 mm which is too much zoom, not only practical
I think you should go with Canon EF 50mm f1.4 USM Standard and medium telephoto camera lens Canon SLR 50 mm standard lens with f/1.4 maximum aperture for Canon SLR 2 high refraction lenses and Gaussian optics help eliminate astigmatism offers crisp with a hint bit in the Extra-small maximum aperture Micro USM focus adjustment and full-time manual focus action than 2.9 inches in diameter and 2 inches long, 1 year warranty
Samyang 85mm f/1.4 vs Canon EF 85 mm f/1.8 USM