I like the Tammy. I own it (for Nikon), and it's a really good lens. The resolution is not on level with the primes, but it's good and has no real weaknesses. I'd definitely go for it. Combining good sharpness, really good built quality, weather sealing and image stabilization it really is a great tool for events (2.8!), traveling (weather sealed 24-70), wide angle studio/ location work in people photography, video (IS!), landscapes... In the studio I don't use it much, but it's probably the lens I use the most when I leave the house.