Originally posted by gazonk Are you guessing this or do you know for sure? 20mp would be kind of "meh" (20 vs 16 is really a quite small difference - only 11% more pixels in horizontal or vertical direction) - except if it has even better DR and high ISO than the 16 mp sensor.
That the 24 Mpixels Sony sensor suffers from crosstalk is a fact confirmed by the test of many non-retrofocus wide angles and ultra fast standard to short telephoto lenses with symmetrical design (aka double Gauss).
That Pentax abandoned the "original" K-3 with 24 Mpixels Sony sensor in favour of K-5 II when they discovered, quite late during the development phase, how poorly the prototype behaved with some prestigious lenses (FA Limited) was indicated to me by a very reliable source whose identity I cannot disclose here.
That the new Sony SLT Alpha 58, supposedly announced on or before next Monday, will feature a 20 Mpixels sensor is an insistent rumour, probably true since we are so close to announcement -answer in a few days.
[Edit on 20th February: Sony Alpha 58 was announced today. It features a brand new Exmor APS HD 20.1 Mpixels CMOS sensor]
That Pentax K-3 will feature the same sensor is pure guess on my side.