順便翻到一篇國外的心得文

http://cjeastwd.blogspot.com/2011/10/portrait-lenses-5d-vs-gh1.html

Perhaps the new Olympus 45 f1.8 lens would solve these problems and yield a lens which would：

have the contrast I find in the Olympus 100 f2.8 on full frame,

have at least similar (if not better) sharpness,

be more compact and light weight than the FD f1.4.