I guess I'm the odd guy out here, because I don't get the interest in 16-50 at f/4 over 16-35 f/2.8 even with the IS.
Don't get me wrong, I LOVE image stabilization, and I like it on the new 28 2.8 IS. But f/4 does nothing for me, especially in the longer focal length; f/2.8 give me a lot of extra light when I need it.
The 14-24 could be interesting if it doesn't flare like the 4th of July as it does in Nikon-land. Otherwise I am only interested in replacing my 16-35 2.8 II ... IF version III is significantly better, and the upgrade doesn't kill my bank account.
I'm with you there! The problem with the Nikkor 14-24mm lens is that there is a very vocal group who keep telling every one that it's the best wide lens ever....and yet filters are a pain. The curved front element is very prone to damage and even water drops seem to get magnified on it. Sure it's image corners are sharp wide open, but it's not a lot greater than mose wides when stopped down (ie landscapes). It flares badly due to the bulbous front element and the angular distortion is quite high at 14mm. I don't really see much photographic value of those extra 2mm over the far more versatile 16-35IIL.
The 16-35IIL is a little dated as a design. Newer coatings would be good and less CA. Sharpness, well it's OK but I'm sure Canon can coax a little more line resolution out of a re-design. The thing I love about the 16-35IIL is that it is so versatile. It does so much so well. If I need a wide lens I can rely on...its a 16-35IIL.
I had a 17-40L for a few years. It was very nice and almost the equal to the 16-35IIL optically, except the f4 and focal range. I really liked this lens but I needed the extra stop. I used to have an ef-s 10-22mm, which again was very simular. Not as bright but again very simular to the 16-35IIL. I'm sure the extra focal range will be welcome by many although not the revised entry price I'm guessing! I don't really see the need for an image stabiliser on a wide lens. Although a lot of people will be using this lens on a 1.6x crop...so I guess it makes a bridge lens for 1.6x to full frame migrators. on a 1.6x crop it's an effective 25-80mm, quite a nice range.
Given that all of Canon's recent lens releases have been steller (I think everything AFTER the 50mm f1.2L have been amazing optically), I'm sure these two new lenses will be remarkable.
Agreed ... the 16-35 II is extremely versatile. It's very resistant to flare and possibly the only UW zoom that can get a decent shot even with the sun in the frame.
Of course I wish it was better in some areas. I wish that with every one of my lenses. But at the end of the day, it's the best, and most versatile, UW zoom available for Canon FF today, including the Nikon 14-24 with adapter.
Still, I hope they release a new, sharper, smaller, lighter version III with even better contrast and lower CA's.