The first batch of testers are writing their impressions of the GXR. What are the most important aspects to you? Its ergonomics and operating speed? Or the image quality?
For the first two aspects, you can only choose to believe what are being written by the tester unless you can have a hands-on yourselves, which is always the better way for making an informed choice.
For image quality, the following are some aperture-cum-ISO-test shots taken with the A12 (50mm lens with a APS-C size sensor) by a Japanese tester for you to make your own conclusion (you may download these images to view the EXIF data):