I'm looking at getting a 70-200. I'm I correct in saying that the image quality between the 2.8 is v1 and the f4 is will be the same ? If so I can get a used 2.8 for the price of a new f4. I don't normally buy used lenses but if seems to make sense to get the 2.8 if I can ($1,500 budget) is the focus and IS the same on both ? Thanks
Cceck my threads where i compared my ver I and II with 135L.



