My two cents: Minolta AF 135 2.8, all shots aprox. f4 with K&F adapter on a X-T10
DSCF1634 by Manuel Bustos, en Flickr
DSCF1599 by Manuel Bustos, en Flickr
DSCF1716 by Manuel Bustos, en FlickrDSCF1684 by Manuel Bustos, en FlickrDSCF1653 by Manuel Bustos, en Flickr
And for comparison, this is a fujinon XF 60 mm macro. f4DSCF1641 by Manuel Bustos, en Flickr
Both lenses are tack sharp. May be the fujinon xf is even sharper... or not, I couldn't really say