It is a big debate between the a 135 full-frame sensor and APS size sensor use in nowadays DSLRs. People for the full-frame sensor saying that a bigger sensor always have the advantage of lower photo-diode density, lower noise, more pixels, more resolution... so on and so on. The current blead of APS size CCD/CMOS sensor using in Canon, Nikon, Pentax and Minolta are transitional products because of the high production cost of full frame sensor... blar blar blar.
I honestly don't see the point of clinging to the so-call full-frame format and worship it. A lot of discussion had been on this issue, and pointed out problems of a full-frame DSLR based on the existing lens mount system. The CCD and CMOS design cannot take incident light at a great angle, and therefore will post vignetting problem when using traditional design wide-angle lens. Yes, you may redesign the wide angle lens; but then you will be limited by the physical size of the lens mount, which is barely bigger than 135 full-frame size. Tests like this has proved the D2X actually perform better 1DsMKII. See the vignetting picture in the test and you will be surprise how badly the 1DsMKII and hte 17-40/4L lens combo performs.
If you are avocate of 135 full frame DSLR. Don't be disappointed. 36x24mm sensor size is actually the next wave of DSLR and will be popular in the foreseeable further. Just don't expect it to take you old 135 lens. It will be a 120 DSLR.
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