Hi, Sorry if this is discussed elsewhere I cant find it. I'm wanting a prime lens, either 14/17(ver1)/19/20mm I'm wanting to know which focusses faster on the olympus epl3, and if its the 20mm is it that much faster to justify an extra £100.Advertisement I can get all the others second hand for about the £100mark but the 20mm is about £200, which I could stretch to. I dont have a very good job so cant afford too much. I do a mixture of indoor and outdoor shots, I enjoy primes on my film cameras so want one for my digital. Also feel it would be a nice to have a combo that would fit in my jacket pocket. Thanks in advance!