Exactly.
I had the opportunity to test drive both.
There’s one reason to get the GLS instead of the X7, and that’s the E-ABC suspension which is a masterpiece. In the 580 you’ve got also the M177 V8.
Without E-ABC, the X7 is way ahead compared to the GLS, which in that case drives like drunken seamen.
It‘s a pity, that in the LCI the quality of the interior has been reduced significantly, pre LCI is the way to go.
Also I prefer the N63 to the S68 regarding the engine noise, the latter has the M5 header which changes the engine note significantly.