Sorry, if I were to give a different perspective.
1) The four-thirds 12-60mm f2.8-3.5 lens, when used on EP3 or OMD EM-5 (with adapter, of course) is a bit slower, but the pictures are very sharp. I have taken pictures with the 12-60 mm. However, the 12-60 appears heavy when paired the EM-5.
2) I was fortunate to meet one of the Olympus reviewer in Malaysia and he was using the EP-3 with the Micro four thirds 14-54mm f2.8-3.5, and this was again, less weight and sharp pictures. Of course, the speed was slower than with the kit lents.
As most of us have four third lenses, it would be a waste not to use them
3) The 12-50mm f3.5-6.3 micro fourthirds lens is not too bad, it gives sharp pictures, and speed is acceptable. With this EM-5, if you switch the digital projection on, you get 2xzoom, which is fantastic. The 12mm is wider than the 14mm, so it helps in your picture taking.
4) Of course, the prime lens is mandatory for use with the OMD EM5. But for those like me, it again involves changing lens. For those who don't mind, this is fantastic sharp.
5) latest, I found out that using OMD Em5 with the zoom micro lens, 14-150mm lens, there are good reviews.
I was told from reviews that the 12-50mm lens is not good for video, in fact the 14-42 MKII is better for videos.
Summary:
a) Prime Lens is good, expensive, with leica prime the best.
b) 12-50mm micro lens: has the macro as well, so good for general purpose.
c)re-cycle your four third lenses. I regret selling my 14-54 f2.8-3.5 lens, and this version I is a better made lens (material wise).
My two cents worth.
Love to hear your other views, as I am still making up my mind on the final list of lens for the OMD EM5. The 12-50mm micro lens gives me 2xdigital zoom, macro and wide angle.
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Which combo would you go for?
12-60 and sell the 12-50
14-54mkII and keep the 12-50
14-54mkII + which wide angle lens
thanks for hearing me out[/QUOTE]