I'm looking really hard at my first zoom lens. The Olympus 12-40mm f2.8. I've been getting tired of swapping back and fourth between my two primes (Oly 12/2.0 and 45/1.8) when I work and I'm thinking that the 12-40 may be the perfect choice. I could carry that lens and my fisheye and start thinking about a long lens finally. I thought I'd work more with primes but my style of shooting has evolved to where a zoom may be the better choice. However, will I experience a degradation in image quality using this zoom over the wonderful primes I currently have? I know I'll give up a little on the long shots (going from a 45 to a 40) and also a bit on the aperture going from a 2.0 to 2.8, but does that sound significant to you guys?