I am interested in coma too. I do have 16-35 f/4 L IS. It is excellent. Super sharp, IS, low coma. Only I cannot enjoy low coma a lot since it is f/4 and I use my 14 2.8L II for landscape astrophotography. It has some coma but it is not terrible. Canon showed us that they can deal with coma in 24-70 2.8 II and 16-35 f/4L IS so I expect this lens to not disappoint. My dilemma will be that I cannot sell my f/4 since its IS makes it invaluable in museums (and my 14 is small and fits everywhere). Choices, choices...j-nord said:That 16-35 improvement looks impressive! Now I wait for coma testing as that will determine whether the f2.8 or the f4 will be my next UWA lens. I suspect the coma will be 'good enough' for me and it will be a matter of how long do I have to wait until I can afford it
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