I had heard that the Sony image quality is not as good, also something about flash shots being poor (I think).
I also looked at a Sony T3. Very nice build quality (although no better than Canon)and 2.5 inch screen, but again I heard bad things about picture.
For an ultra compact the sd300 (Ixus 40) was the only camera I could find (second on my list was Panasonic FX7) where I thought image quality was not too compromised, and infact marvellous for such a small camera.
I am still unimpressed by the Pentax S5i shots, which seem blurry/ noisy to me- but perhaps it is just my eyes!