Now that the first units are sold, folks discuss image quality of the brandnew X20 versus the X10. It's about the EXR versus the X-Trans and about improved out-of-camera jpeg. However, to me the image quality of both cameras seems to be very good. But what about the improved optical viewfinder of the X20? How does it perform in daily shooting? Is it worth heading for the X20 instead of getting along with the X10?