I have an issue with tonality, because in my view tonality has everything to do with postprocessing and little with sensor. The sensor itself is a linear device, in essence, and just delivers a signal. Interpretation is done in postprocessing. So I cannot see how MF cameras can have better tonality. If they have better DR, that could be helpful in achieving better tonality.
I have downloaded the files and played around with them. In my view the P65+ was vastly superior to the Canon 1DsIII in DR
. Both lenses had an incredible amount of lateral chroma, by the way, but that could be cleaned up in postprocessing.
My findings are here: http://echophoto.dnsalias.net/ekr/index.php/photoarticles/41-phase-one-images-for-download
I have done a similar comparison on the Leica S2, using images from "Diglloyd": http://echophoto.dnsalias.net/ekr/index.php/photoarticles/38-observations-on-leica-s2-raw-images
The emphasis in that article was on aliasing/Moiré. If found it pretty clear that the S2 was impressive in sharpness, but I actually found that the Nikon D3X was better in DR.
Finally I also run a comparison on the Pentax 645D. In this case I made actual prints and looked mainly at resolution. The Pentax was sharper than the D3X. The images I analysed were not appropriate for checking DR, but I guess that the Pentax is pretty impressive in the DR area.http://echophoto.dnsalias.net/ekr/index.php/photoarticles/51-a-closer-look-at-pentax-645d-image-quality
Some unexpected Moiré was visible. I have seen some aliasing in most MF samples I looked at carefully, so lack of OLP-filtering comes with a price.
To sum it up: the samples I have seen deliver on promise regarding sharpness. I don't think that Leica S2 has better DR than Nikon D3X. Aliasing may be a problem at some times. It seems that stopping down to f/11 on 6 micron pitch sensors can eliminate most aliasing artifacts due to diffraction.
Here are RAW-file comparisions (I think Canon 1DsIII / P65+ & D700 / P65+):http://www.phaseone.com/de-DE/Downloads/Sample-images.aspx
You can play around with the files.
You need Capture One Pro to do so… there's a free 30day trial on the website.
Note that some images already contain settings (i.e. not "preset" settings; they are adjusted for certain purposes. There was an article these files refer to, hence the adjustments applied to the captures. But I don't know whether or not the article is still available somewhere... )
Also note that in terms of tonality
a "comparision" of course is seriously limited by the quality, gamut and linearity of your monitor.