I'm assuming you have a fair amount of space and budget, so:
With an island, is there space for one person to work at at and another to comfortably pass? Depends how you use your kitchen of course, but DH and I work together (sometimes with others too), and many islands aren't far enough away from the wall/work surface.
When we (eventually) replace our kitchen, we'll raise the work surface height; I'm not tall, but prefer not to bend at all.
Another one who'd recommend drawers rather than cupboards - for as much of the kitchen as you can. I've even seen drawer style fridges, but not close up to know how much space they need (lots if each drawer is insulated).
We routinely need 5 rings due to a mix of dietary requirements, and have a stand alone induction ring in addition to our 'normal' cooker. 6 rings sounds great!
I would go for a double drainer sink, which comes right to the edge of the work top, as it makes draining heavy pans much easier (I can rest them on the edge of the sink). However if you've got heat and water safe granite, that's less of an issue.
Would two dishwashers improve your life? We don't have space, but you might - take it out of one, use it, put it in the other (obviously you do have to put away a few things each time!).
Worth thinking where you'll store utensils and cooking oils - ours are out on the worktop; that works for us, but I'm getting the impression you'd prefer things out of sight.
We've only got three drawers. In our previous house, there was a run of small drawers just below the work surface right the way round the kitchen (neither kitchens were installed by us). They were enormously useful, and are definitely on our 'would have if we ever get round to redoing the kitchen' list.