actually, its pretty pointless just looking at pictures taken by a camera to see if good or not, unless they are being compared to pictures taken by other cameras.
a picture taken by a prosumer, or even a good P&S, can also look good and sharp.
in any event, a picture taken by a A100, compaerd to a canon or nikon, will generally be int he same ballpark, assuming reasonably parity of lenses, and assuming the ISO is generally within their optimal range.
certaint at 4R or 5r or even 6R, you wouldnt be able to tell the difference without pixel peeping.
teh same can be said of olympus, orp entax or samsung.
its the functions, functionalities, lens range etc etc, that should be just as determinant, if not more so, than just picture quality.