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Neither: both are extremely weak wide open, but the 50 is recognized as the worse of the 1.4G group.
Whenever I tried it, the 50 1.4G was jjust bad, too little sharp wide open.
On the other side, the 85 is a complicated lens. It is "sharp" enough at 1.4, but is loaded with very high aberrations, and it does focus shift, meaning if you calibrate it for 1.4, then good luck at 2 or 2.8, and vice versa.
I just sold mine, and couldn't be happier...
To ensure proper focusing, provided you don't need f1.4, you could get one of the 2.8 zooms.
Or, if f2 is mandatory, I'd go with the 105DC: if your copy does not need too much focus calibration, it can be an exceptional lens.
Can't comment on the 85 1.8G, never tried it.
One suggestion, if you can: try *for real* before you buy. Most of these lenses would appear "nice" in a shop. But on the field... good luck with them!
I there much of a difference between the nikkor 50 f1.4G and the 85 f1.4G besides, the 50mm to 85mm, when taking portraits. What lens would you rather have for shooting portraits and live action play time in the yard.