Yes, it arrived on Wednesday. Given that I also, fairly recently, got a 7DMkII and battled away for a number of months to properly get to grips with it in terms of learning all (most?) of what it can do and how to best set it up, setting up the 5DS has been great fun given that the two share many characteristics/features. The 5DS does, not surprisingly, have things that the 7DMkII doesn't; e.g. the ability to customise 'Quick Control'. And that is absolutely wonderful. But in such as assigning functions to various buttons, it is just the same.
What is utterly awesome is what I'm seeing as a result of my other purchase. I decided to really push the boat out and have also bought the 11-24 f4 L. Now, I thought that using the excellent Tokina 11-16 f2.8 (which I've traded in) on my crop frame body was wonderfully wide. This combination of the 5DS and 11-24 just takes the term 'wide' into a whole new ball park. It is incredible.
I was just thinking as I was out walking with my dog within the last hour, that I will have to re-learn how to try and 'see' pictures of such width. I do think about as a re-training activity.
Anyway, I'm having fun!!