@H - You've helped so much already H, but care to explain what ... "Particularly when you have a full frame body; you can exploit the centre cross-type f/2.8 focus point (with AF point expansion)"... means please?
@Troy - thanks Troy. Yes I did understand your observations thanks. I just wanted to check that the focus speed of the zoom didn't become an annoyance to you after having sampled the faster focus of the prime lens.
Thanks again guys