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F4 will allow decent background blur particularly at longer focal lengths, perspective is changed though. The longer the focal length the flatter the perspective.
If you're taking portrait shots for example at 35mm f2.8 and one shot at 100mm F4 you may have the same background blur but the perspective of the subject will differ. If you're not sure try and find a hire place and hire both an F4 and F2.8 for a day.
The 70-200 f2.8L is a heavy beast of a lens, the F4L is very light in comparison.
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