Quote: I have wondered if you would really notice any difference at all after around 10 megapixels or so in a print.
If you print 6x4 or 7x5, no way is even 10 MP justified. If you print A4, 10MP is OK but you don't need any more. If you want to print A3+ then more than 10MP may be useful (assuming the lens etc. is up to the job).