better sensor? You've got to be kidding me. Pana/Oly all uses same 4/3rd sensor. If you want better sensor, wait for EOS M. But alas, they don't have built in EVF (although I really hope they release one with EVF, but then that might affect their entry dSLR market so not sure if they'll do that).

For major reason 1 and minor reason 3, you could actually go for Pana G or GH series.

dpi number in exif means nothing one, because when you print you need to specify a dpi again, usually 240 or 300. More no good (can print less color), less also no good (soft picture). Even if you have lower mp, software can enlarge your picture to the require dpi.

dpi is the most confusing "parameter"

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Added on August 16, 2012, 3:06 pmI want to ask, I see those people use "snail eyes"  like flash on their compact camera hotshoe. What are those for and can give a few brand/model for me to google more?

Yes am looking for M43 for my friend, dont want to let her use the normal digital camera, a waste of money. She is just an amateur user with no photography basic actually, any good camera will do. Thank you guys!