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Interesting to see how these lists compare a year later. Resolution isn't everything- I would put the Alexa on top for overall image quality. They designed their sensor after learning from years of experience building film scanners.
We used to argue about whether digital effects for audio would ever match or surpass analog gear. Finally a few years ago, even the most stalwart musician friend finally agreed digital matched analog with the Axe Fx: http://www.fractalaudio.com
I just watched MiB II again and was blown away with some of the shots in terms of skin tone and color (Eastman EXR 100T 5248). Is it possible to convert my 5D3 (RAW) or FS700 (RAW) to look like that with something like FilmConvert (two cameras I use)? No, not yet, as I don't think anyone has accurately modeled the film process well enough yet to emulate what film does with light. Initial ADCs and DACs sounded harsh and brittle when CD's were first released (folks still dig records and tapes). Now digital audio is fantastic (and most folks listen to highly compressed audio on iPod/Phone/Droid or cheap computer speakers!).
Digital cameras are still very much like early digital audio. Matching the pleasing look of film has not yet been achieved with digital; so far ARRI has gotten the closest, and FilmConvert has made a good start. Accurately modeling and simulating film with digital cameras will happen someday. Why bother? Because it looks better, especially for narrative (where unreality and dreaminess are helpful in storytelling). Dynamic range, resolution, lack of aliasing, and accurate color processing are all very important. The last piece of the puzzle is (optionally) being able to get highlights and skin tones etc. to look like film.