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Quite an interesting question.

I'd say that whatever has been said about the 9,3x62 and 9,3x64 can be applied to the 9,3x66 as well. It's such a close call. A tad more powerful than 9,3x62 (and it's not wanting in power), a tad less powerful than the 9,3x64.
In this regard, the "best" option is probably the Brenneke cartridge but as such no reason not to use the new Sako.

The Expert magnum is unknown to me.

The Vom Hofe has some following to my understanding, but I don't know the cartridge.
If decent bullets are available then it'll probably be a nice cartridge.

.411 Hawk
Ahhh.... This is the one I've been thinking about.
According to Z-Hat who invented the calibre they have achieved some marvelous power levels. But I doubt them strongly. And for Africa it appears to me that the pressures are very high in order to achieve any meaningful velocities.
If I compare the .35 Whelen and 9,3x62 data to the claimed .411 Hawk data I doubt the figures. Any factory loads to the 9,3x62 are pretty hot as such and to better them is a challenge, indeed.
Same applies to the .35 Whelen: the handloaders have already made it about as hot as it goes and to claim the same or almost the same velocity from a .411 does not seem plausible.
Furthermore, the .411 would require very heavy bullets to achieve .300 SD: about 360-370grs. Now, the 9,3x62 is loaded with 286grs bullet which pretty much gives you the indication of max. velocity for that weight. 320grs is available for the 9,3 so that might actually be better than anything for the .411. And heavy bullets would have to be seated pretty deep reducing the powder capacity (or increasing the pressure).
Are good bullets available for the .411? Woodleigh makes heavy ones, as does Hawk bullets. By and large, though, a limited selection.
Why I'm keen on this is that it's fit a Winchester mod. 1895 lever action's action as the .30-06 is the longest that fits it.

Lastly the Mauser.
I'm afraid that neither Boddington nor Taylor spoke very highly of it.
The longer 73mm is more highly regarded. Apparently, the problem with the 68mm has been too light bullets - so why not take heavier ones, instead? The velocity might be a problem as even the longer (i.e. .404 Jeffery) one does not give very high velocities.

One general comment on all of these is that they have quite moderate velocities, so none of them certainly is a long range cartridge really. And if we consider that the "optimum" is in the region of 2100-2400fps (640-730m/s) then certainly all the cartridges should be in that bracket. And remember to use premium bullets!
The new Sako is probably the best in that regard. Then again, DG is hunted in close quarters so I don't see this as an issue.

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A.k.a. Bwana One-Shot