6D and 70D share the same technology - but the video is awesome on the 70D - the focus pulling is brilliant - just like watching scenes on the telly.
My lenses only total four. The kit 18-135 STM IS
So you've got the 5DII and 70D?
I use the classic 1D (Mark 1) as my second Canon cam (the munching hamsters were with that). I do a lot of video at times too, so might need a more modern Canon as back-up. Will check out what the 70D offers then, but a grand for a backup camera is a bit steep for me, i reckon.
I'm also chasing the MPE Macro...it's totally unique! The 100-400 You don't really need to get. Just get the
Kenko C-AF 2X Teleplus Pro 300 DGX green-dot version (specifically that one) and it turns your 4/70-200 into a 8/140-400 with only a minimum loss of quality. You still get AF as the Kenko doesn't register the aperture with the camera, but it does mean you'll have to compensate the expected exposure. You lose only IS and a stop or two at the aperture level. Saves you tons of money. And the 70-200 on its own offers better IQ than the 100-400.
Yeah, extension tubes are great. Diffraction hits after abt 40mm, so the MPE will be killer when I eventually get it.