Peeve 1 clearly hasn't used both the XA1 and XM1. I have and the image quality of the XM1 is better, and noticeably so. If you know how to get the best out of a camera, the XM1 is a fantastic camera. I don't use auto settings, but did try them and even that produces great results. The XA1 just appears a little better because it is set up to look appealing to the point and shoot users. They just appear a little sharper, something easily changed in most cameras. Takes seconds to make the sharpness of the M1 match the A1. Add to that the better colours of xtran cameras compared to bayern, personal opinion echoed by many, and you have a great camera.
You always get comments that show people have never used a particular camera and are repeating what they have read. Such as try fitting a g1x in your pocket or focus in the dark. Both can be done easily. Probably not worth stating negatives about a camera unless you have used it. Canon g15 may not match the g1x for IQ but it is not aimed at the same users so doesn't need to.