well, my X10 is about 1yr old only and yes I saw many reviews saying x20 is way better, and I did try it, to me I cant really see the diff in IQ, but its way faster than x10. So well I guess it doesn't justify for me to move to Xe or x20
I don't have any experience in photography, when I got it, I used to see my photos on the tiny LCD and my 26" monitor, the real surprise came when I play it on a 40" LED TV, its "WOW!!!", the color are just so nice, dont know how describe it but it looks so diff from my previous Sxxxxxx and I used to borrow my friend's Cxxxx. Plus the low night shot has contrast, stunning. Good detail tho its only 12Mp. That's more than enough for me, haha.
u guys go enjoy yr mirriorless and I stick to my x10 for a while more