To me these announcements are just a big YAWN. The EF lens upgrades that Canon needs to get out the door just keeps getting longer and longer...
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Maybe it'll be a real medium format: 6x7
You mean 6x6, right?
Definitely the same old sensor technology (higher ISO shots)...
Are you sure? In the Sky of the Nightscene I would expect more banding. But these are JPEG anyways so what I'd like to see is a pushed RAW in order to see if it still has the same banding.
I own the 200 f/2 and have for some time now. It is my main lens that I use as it is just hard to find anything that works better (for me). As for a replacement, I can see where they would significantly reduce the weight and improve the IS by a few stops. Those two things alone would make it a great purchase but the MK1 will still be a great lens as well. I don't think a newer version would reduce the value of the MK1 so don't expect to see mine up for sale at 1/2 price.
Last month (Feb 22 Feb 2013) I bought the Tamron 28-300 VC lens (from B&H) for those times when I only want to carry just one lens mounted on my 5D MK III ... I am not sure if it was my copy of the lens or it is always like that, but that lens was very soft, made strange audible creaking noise when the VC & AF were being engaged and the AF point would jump after taking the shot ... so I returned it and bought a Nikon 18-300 VR lens & a refurbished Nikon D7000
Anyway here are a few images made with the Tamron 28-300 VC (mounted on 5D MK III) ... the firt and the third images are straight out of the camera ... the second and the fourth are after editing.