Just a quick comment on the integrated bag loops. I am not really a fan of them on any saddle because they limit what you can use to attach bags with. I rigged up a DIY quick release for one of my bags and I cannot use it with integrated bag loops. You can see the Giles Berrthoud loops are particularly tunnel shaped. It probably doesn't matter to most people, but it's a small thing to think about.

Here is my DIY bag release with a Brooks pro and viva bag loops.