Replacement for my Canon EF 500mm f4 L IS

With my old 500 no gone forever it was time for a replacement !
The Canon EF 500mm F4 L IS ii comes in at anything between 6 and 8k, I just cannot warrant paying that much for a lens, I paid 3k for my mk1 and that was pushing it.
So I set about looking for an alternative, I came across the Sigma 150-600 f5-6.3 DG sport and started reading reviews and when I say reviews I mean loads of them, about bothe the sports version and the Contemporary version.
The Sports version (Sv) is twice the price of the Contemporary version (Cv) but has a better build quality, so seeing as it may well get wet and dusty I decided that I would try it for the price its a punt but looking at results online pictures look tack sharp.

I also decided to get a Canon 100-400 f4.5-5.6 L IS ii to go with my new Canon 7dmk2.
So I have ended up with two new zoom lenses for the price of my old 500 prime, whats not to like !

The Sigma comes with 3 year Sigma warranty too boot.

I purchased it from Currys PC World best deal I could find £1192 got it home today unfortunately to late to get it out in the garden to try a few shots.

One innovative thing from Sigma is the Sigma USB Dock this give you the ability to programe the lens with various parameters one of which is AF Micro Adjustment, but here Sigma have taken this to the next level by giving you the ability to MA the focus at four yep four focal lengths 150, 250, 400 and 600mm.
Not only that but they then give you the ability to MA at four distances at each focal length, giving a total of 16 points of focus throught out the focal range which if its as good as it looks will be a big step in the right direction.
Compared to Canon's zoom lens MA setting which would be for this lens at 150mm and 600mm the rest it will guess at.

However its not a perfect solution and I believe Sigma have missed the point, if I MA the Sigma  for my Canon 5dmk4 and write that configuration to the lens if I then want to pop that lens onto my Canon 7dmk2 the mk4 profile is no good as it was made for the mk4 1

Why there is no option to write a profile to disc is beyond me, you could then create profiles for each body and write it too the lens before going out, having said that you can set up for the mk4 then put the sigma on the 7dmk2 and MA that using the Canon MA on the camera giving the most flexible solution available.