First off, congrats on the purchase. There always seems to be some trepidation about throwin' down that kind of money but, hey, if it's something you've wanted for years, it's only gonna be more expensive in the coming years. (Took me twenty years to buy an H&K P7 and the price quadrupled).
Second off, that's a beautiful piece. As a former-Marine friend might say, "That's a fine weapon". You'd do well to fit it with some premium glass.
Third? Well, I think I read that scope link two, three or four times when narrowing down my selection. Of particular importance, to me anyway, was the mechanical and reticle accuracy. With a firearm of the Sako's caliber(play on words), the accuracy of the scope has to be beyond question. I don't know that you could find that info on your own before making the purchase of something NOT on the list. However, there's the consideration that any MFG in that group is likely to carry the same level of quality throughout their top shelf offerings.
With all that said, I'd have to re-read the link, keeping in mind the platform you have. Off the top of my head, my first instinct is S&B but, like I said, I'd have to re-read the link's particulars concerning that brand and it's competitors.
Your platform deserves glass that's above and beyond. What that glass is, whether it be on the list or not, must certainly be capable of the accuracy needed to support the weapon's capabilities.
I know I didn't answer your question concerning other offerings but, really, what else is there? Leica, Swarovski and Trijicon are the only things that come to mind.
Prior to purchasing my Steiner, I had gone to B&H Photo to finger some optics choices. I picked up a Swarovski and, yeah, that was really nice. Then I picked up a S&B...the difference was like looking through Rx eyeglasses vs reading glasses off the shelf. The difference really was that striking.
A little digging at B&H's site and it seems S&B is the only MFG, at least of those offered, that even comes close to what you're looking for...retail starting at $6K. If I were told that S&B was my only option, I'd be looking at the Hensoldt as well, with the emphasis on the scope's mechanical accuracy.
Further down the line - Leupold and Nightforce, while also considering the Leica and Swarovski. The Trijicon doesn't fit your spec requirements.
If it comes to push-n-shove, compromise on the max magnification. After 20x, things get really difficult to hold steady and mirage effect can be crippling. I think you'll be dialing back anyway on all but the most perfect of days. How many of those have you encountered?
One last thing, scope mount. I'd get the beefiest thing you could find with three sets of fasteners per ring. You don't want something questionable holding a $10K platform together.
Don't forget pics of your new pride-n-joy in it's own environment!