But, i'll disagree with the assertion that a 5DMkII wouldn't be much different from a Contax G2 output. My 5D2 is at least equal to my Bronica RF645. Possibly better, but i've only had both for a limited time and only shot them on the same subject matter once.
The common testing methodology is to blow up similar portions of a negative and a digital file and see which contains the most 'information.' Film can record certain minute details that digital might not. But, the digital files are infinitely 'cleaner,' and the itty bitty bits in the film file that might be seen at 100%+ on a monitor are not so much visible on a print. My digital files always look sharper and more detailed than my film scans and i'm talking about medium format. I don't even bother to compare 35mm film to digital anymore.
Ok, you are probably making the comparison from scanned photos? This is a big deal actually, not least because of grain aliasing which happens pretty much always when film photos are scanned. Less with good scanners, more with lesser ones.
Also, you are saiying 5DMKII is
equal, then you are saying film can record more detail but digital is
cleaner. So they are not equal, but maybe about as clean, visually.
I am quite sure the Contax G2 reaches more or at least about same resolution as the Canon. The result will be different in any case, so if we want to test "which one is better" we need to choose the properties we are measuring.
Also, we cannot compare just a single ISO/ASA speed and make a conclusion by that. Sure the digital is much cleaner when shooting for example 1600 or higher, but are you sure digital matches slow B&W films of 50, 25, 20 ASA.. Or Astia 100F? Personally I dont really know and probably not even care, but I am guessing this is not directly compared.
Last you are saying your digital files look sharper... But sharpness is subjective and visually and psychologically observed. Digital scans can be sharpened easily and digital photos probably are processed inside the camera anyway if not in Photoshop or such, so it is just fair to do that to film scans too, when comparing.
If you want to compare
film to
digital sensor, you have to remember that you would have to scan the film, which means you will have the properties of the scanner (usually not a drum scanner with great resolution and these times often a not-very-good flatbed) included in the test. Or you could choose to print the digital file, when you will have the properties of the printer...
A wet print is affected by the printing optics and other limitations, but what to do with the film if it isn't enlarged? Anyway I'm quite sure that a wet print out of film is much less grainy than a film scan.
When compared resolution and graininess with suitable (good) methods, at slower ASA speeds, I think 35mm film will still hold its ground quite well vs. digital cameras. I dont know which one actually "wins" (not that I care) but the 35mm is not way back yet.