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I once did a test between F2.8 and F4 trying to decide between a Nikon 70-200 F2.8 or the newer F4.
There wasn't a lot of difference in background blur and either will produce it.
F2.8 is good for indoors but then in the case of Nikon the F4 version had a later version of vibration reduction.
Also with excellent high ISO low noise performance the need for F2.8 for indoors is less. Between excellent high ISO performance and low high ISO noise there is even less need for F2.8. Savings in cost, weight and size add to the advantage.
However after having said all that I do like F2.8 lenses a lot. If you were going to use it for astrophotography F2.8 is important. F4 really requires tracking.
Greg.
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