After completing my review and processing of several hundred shots taken on our recent travel to Turkey, I have concluded that my A55 underexposes by 1/3 to 2/3 stop on most (90%+) of my shots. I was generally shooting P or A mode with auto ISO, single focus point, center weighted metering. I haven't had the opportunity to compare to Multisegment metering. As I was shooting RAW, exposure adjustment was simple, although required, for nealy all shots.
If interested, you are welcome to look at a hundred or so shots that I have posted here. Several pics, mostly shots that include me as a subject, were taken with my wife's Canon A95. Helpful criticism is always appreciated.
BTW I am a huge fan of this camera.