there seems to be alot of nice glass that can be mounted on 4/3s, im currently using just the 20mm so im not too familiar...will i need to get the EVF? and do the lenses work in A or S priority mode? id like to pair it with a portraiture-length lens under 500$ with a large aperture for night shots...from what i read most of the 50mm 1.4s are about the same. the hexanon 57mm 1.2 looks promising too; is it worth it to pay more? just wondering how you guys came to choose among all the brands?