howie_wu

<p>How can you want to "upgrade" to FF and also contemplate the 50D at the same time? This does not make any sense. It's also not clear what your budget really is (the 50D at this point can be hand for $200-250 in good condition).</p>

Even though Canon has lagged behind in the sensor department in recent years, it is still the king of telephotos. I have no doubt the new version of the lens is superior to the old one in every way -- better IQ, better AF, shorter close focus distance hence larger magnification, better IS ... Well, except it is bigger and heavier, but I can live with these. I had the version I for a decade and loved it, but I immediately sold it after the announcement as I am convinced that the new one will be better. (Meanwhile, I have my 300mm f/2.8 II as my telephoto).

<p>The 24-105L is better than the 28-135, and 24mm is better (at least for my taste) as a wide angle (I've had both lenses). The 28-135 gets rather soft toward the long end, but the 24-105 is sharper.</p> <p>But I actually got rid of both and eventually got the 24-70 f/4L. I think this is a much better lens than the other ones. Sometimes I miss the reach (but I have other lenses to cover the range), but other than that, I am very happy with the 24-70 f/4L. It is much sharper, has lower distortion and vignetting at the wide end, and has a nice macro capability that comes handy when you need it.</p>