Do you know why they had to change the filter size or did they just change it to change it? I see that as a move similar to Apple. They seem to be changing their charging ports for reasons that do not seem entirely clear to me.
I'd guess it was an attempt to reduce vignetting, particularly with additional filters. It is a bummer, since 77mm seems to be the largest relatively standard filter size. If only 4x4 matte boxes/filters weren't so cost prohibitive...
I would have embraced Apple's new port 100% if it were thunderbolt.
1) It would have made the current iPhones and next iPads PERFECT lag-free DSLR monitors.
2) Potentially uncompressed sensor data recording.
3) Immediate sync
4) Smaller ports mean easier weather resistance (@ $700, clearly they don't care).
These technologies (phones/tablets + cameras) were born to sex each other... The past 4 years have been one big tease.
I have the 24-70f2.8 (I) and I use that 80% of the time on my 5DII (use the 85 f1.8 second most).
I have no desire to 'upgrade'. The first version is a fine lens, sharp wide open with great bokeh. The price of the new one is ridiculous!
I love the bokeh and color of the 24-70 I, and f4.0-5.6 appear unbeatably sharp.
I feel like II really needs a new 46MP camera or
something to make the added sharpness noticeable.
No IS is fine for me from a photo perspective, but I would have considered upgrading if it had IS for the sake of video.
Of course, it degrades image quality, so it's not ideal... but rolling shutter is MOST noticeable (and hardest to fix) when walking/running.