The test below is very much unscientific, it was conducted just out of my own curiosity. All three cameras are totally different beasts and putting them side by side might be not fair, but I as many others was wondering how uncommon CFA (X-Trans and Foveon, APC-S) sensors stack up against leading 24x36 Bayer.
All cameras were set to: AWB, RAW, on a tripod with self-timer, aperture @ f/8, auto-focus
Nikon D800E: lens Nikkor AFS 50/1.4, post processed in ACR 8.6
X-Pro1: lens Fujinon XF 35/1.4, post processed in Iridient Developer 2.4.3
DP2M: lens Sigma 30/2.8, post processed in SPP 5.5.3
The garden scene:
I was testing colour rendition and ISO performance (DP2M was excluded from high ISO tests due to a well known reason :)
1. Base ISO
2. ISO 1600
3. ISO 3200
You can find all raw files posted at my Dropbox here.
The Eaton Hall.
I came to the Eaton Hall to emulate landscape/cityscape conditions and was mostly testing sensor's resolution / dynamic range at their base ISO.
Set # 1: Resolution
Set # 2: Dynamic Range
Set # 3: Foliage
Set # 4: Close up
As always, you can find all raw files from each set at my Dropbox here.
I also quickly compared D800E and X-Pro1 with legacy Nikkor 105/2.5. Both photos were taken @ f/2.5, manually focused of course.
Both raw files can be found here.
After reviewing hundreds of files all I can say that image quality is less dependant on the modern sensor size but rather on a good lens, shooting discipline (tripod!) and post processing skills. Another observation was that Sigma DP2M is yes, a "one trick pony", but if you know what you are doing you will be rewarded with mind blowing IQ.
I also realized that moving forward from excellent IQs to great PQs is way more important for me :)
Feel free to download files, post process them using your favourite converters and draw your own conclusion.