It is something I've been considering for quite a while and after saving up, I decided to go for it. The lens arrived yesterday and it certainly is a big beast! Weighing in at just under 1.5kgs it's probably not the sort of lens I'll be carrying around with me day in and day out but for those occasions where it does get used, it's going to be a cracker.
I've only managed to have a quick play with it but initial results are that the speed of focussing and image quality are superb. Having the f2.8 aperture available throught the zoom range will allow for some great creativity with the depth of field.
The lens should compliment my Sigma 24-70mm f2.8 lens and I'm hoping that the extra low light performance will add a new depth to my photography that has been harder to achieve in the past.
Check back soon for some test shots when I've had a chance to get out and about with it.