Sigma 135mm F1.8 or Samyang 85mm F1.4 or both?

I feel I would like to answer this but I don't quite understand what you mean.
I'm getting confused. I've got the 105mm f1. 4 but came across a guy on youtube who was using it in crop mode at 160 or there abouts at, f2 or just under. I was wondering how this would apply to the 135?

Edit: Just realised having the 105 already ties in with Kei's recommendation. I have-however ordered the 135 in addition for the additional reach it will afford in crop mode at f2. 7 (or thereabouts).
 
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