Sorry to hound you all again with more on this remarkable little lens.
Mongo has posted a few tests already but this will be the defining one. If this lens can work this good with a X2 converter at wide open aperture, it deserves a gong !
This is one of many images Mongo took after finally fine tuning the lens with the X2 converter on D800 today in park. This was a reasonably long way off across the river. You judge for yourself if cuts the mustard - Mongo thinks it does and he is happy with it now.
The image has had minimal work and sharpening done on it so it is not PP that accounts for the result. Have included the RAW file which has had nothing done to it except resizing for the web.
D800, nikon 300 f4 with 20E111 converter wide open at f8, Monopod, ISO1400, 1/640th, -0.7EV, camera in 1.2 crop mode
original RAW file below