Another lens question

I currently enjoy owning the 50mm 1.4 Nikor lens.
Does anyone see any point in also purchasing the 85mm 1.4 0r 1.8. I of course realise the difference in the focal length and the ability to perhaps isolate individuals, but I thought that cropping in PS would achieve a similar result.
Is the 85mm a superior lens in other ways, perhaps?
Nige
Does anyone see any point in also purchasing the 85mm 1.4 0r 1.8. I of course realise the difference in the focal length and the ability to perhaps isolate individuals, but I thought that cropping in PS would achieve a similar result.
Is the 85mm a superior lens in other ways, perhaps?
Nige