Thanks for the replies.
PP, I think the 'contrasty' issue is what I'm concerned with. As
many of you pointed out, those +1 pics were way overexposed. I
agree with that. But the reason I used +1 was because many details
in the pics were either underexposed or overexposed, and hence look
'contrasty', so apparently adjusting the exposure won't solve the
problem.
My last camera was a S400 (lost it

). Pics taken with the S400
had vibrant and even color distribution. I guess I'm not used the
contrasty pics of the SD20, though the sharpness is nice.