Canon EF 85mm f/1.8 USM lens

introduction

introduced in 1992, arguably the best non-L Canon lens although CA wide open is problematic
on Micro Four Thirds system:
- it gives 35mm eq. of 170mm f/1.8 but with 170mm f/3.6 depth of field (DOF)
- when used with 0.72x focal reducer gives 35mm eq. of 122mm f/1.3 lens with depth of field (DOF) of a 122mm f/2.6 lens
which 85mmm lens to buy?
- the 85mm f/1.2L II gives shallowest depth of field (DOF) and least flare but troublesome vignetting and long. CA
- the Canon EF 85mm f/1.8 USM lens is much cheaper, gives sharp photos wide open with nice bokeh and is much faster AF but has troublesome lateral CA wide open
- perhaps the best compromise is the older Sigma 85mm f/1.4 full frame lens