Thanks Philipus,..
I wanted to say, "best performance" in a compact size, without being ASPH.
My question surrounds the v3 (I have) and v4, but from what I have been able to study with different photos in the real world (Internet photos, flickr mostly, but I do not know that reliability exist), I do not I see a clear difference between the two versions, or that's my impression. I so I have doubts.