I believe mark rented the non IS version, and ended up throwing a lot of images away because they were unusable.
For sharpness, my 70-200 F4 IS is definitely a little sharper then my 100-400mm which is a fantastic lens on it's own.
and it's not like you're getting a run of the mill IS system, it's one of the newest versions with up to 4 stops of stabilization, as well as having a mode 1 and mode 2 on it.
It's still very light and portable.
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