while the 35G is a DX lens, I would not worry about it,, the starting price is reasonable, and you can just sell it used if you go to a FX camera.
in FX mode, limited choices in the 35 realm, could go 35 F2.0,, which is around 349 dollars but of course,, this the ED lens, so can't autofocus on a 5100, or
wow money with the 35 G 1.4,, for like 1700 big ones. Hard for me to justify the 1700 for a 35 mm prime with really no special function. I could see dropping that
money for say the tilt and shift, or say a 14-24 zoom, but for a prime,, I know I know, 1.4,,, but I think if I was a 600 owner,,, I would just get the
35 2.0. if I wanted that range.
for 35,, I just use an old Manual AI lens, 2.0 ,, but if I wanted to go 1.4,, I would get.
a used 35 1.4 AIS
Ok,, I am more old school, and love small solid lens....
of course, almost any of these 1.4 lens have compromises, and one trades off sharpness for speed, and this lens is no exception,,
Hence why I prefer and have the 35 mm 2.8,, which is not fast, but is sharper, and well according to the review of the faster
lens,, until you get to around 2.8,, they are pretty bad,, so,,, I'll just say,, get the el cheapo 35 2.8 for like 70-80 dollars used, save the money for other more exotic lens than the 35 1.4 G or even
AI 1.4
but for a 5100 user,,, I would still get as I stated the 35 1.8 G,,,, DX,, nice,, and yes it is on my watch list ..... (waiting for a sell).