Is the 12-50 that bad

I bought my OMD-5 body only as I have a 14-42 already.

Although I am getting great results with the 14-42 I am going to go back and grab the 12-50. If performance matches that of the 14-42 (with the additional range of the lens + weather sealing) I will be very happy indeed.

I wish someone would make a constant F4 zoom equivalent to the canon 24-105 (perhaps a bit smaller than the upcoming F2.8)