The difference between 6mp and 12mp is definite.
The next FF DSLRs are going to be 24mp.
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But each successive doubling of pixel count is less important, or important to a smaller range of of photographic and print-making situations.
- From 1MP to 2MP made even snapshot sized prints noticeably better, and so was of value to anyone who printed at all, or had a high enough resolution monitor.
- From 5MP to 10MP shows up only with far larger prints and not on any current monitors. Starting at about 8"x10" or above, and then only with fairly close viewing and some types of subject matter.
- From 10MP to 20MP might only be relevant with the rather extreme combinations of:
-- prints viewed from unusually close; far closer than the typical viewing distance of roughly the maximum dimension of the print, and
--
sharp, high quality lenses: only fairly good primes and the best of zooms.
Because with most lenses, the extra pixels will mostly add greater awareness of lens aberrations and not much more image detail (like 14 bit A/D convertors mostly revealing finer details about the sensor noise, unless the sensor has very good DR.)
And with the near inevitable move of all DSLR systems to offering 14MP and above over the next year or two, the visible gap between 14MP and and higher pixel will become even more rarely seen in prints. Near inevitable because of the empirical
Law of the Pixel Count Race: Every new high of pixel count in digicams is soon matched or exceeded by every DSLR system.(Even if this is at some point driven mostly by marketing considerations.)
And Sony just announced a digicam with 14MP, 1/1.7" format sensor.