PAUL LEE

I am new to this forum and had just sold my Ricoh GR. In the past, I have always choose camera with built-in viewfinder, for the GR, I use an optical finder as a make shift. Having owned before X100, X100S etc, I am a bit tired of its size. GR was fine but somehow, the focus speed and the color - personally not to my liking, not to mention that WB. As I researched further, I am interested in the X70. Since I already owned a XT1, I am kind of narrowed my interest between XM-1, XA1 and XA2 as a take-everywhere camera. Am I right to assume the following: 1. XM1 and XA1/2 has different sensor, one with AA filter and one without? 2. X-A1 and X-A2 has not much difference except the screen on latter can be tilted upwards? Anything else that is different between the two? Thanks for all the feedback