Lexus is the only company in the world that has understood that to make a good looking car, you need the right proportions, among which is metal to wheel ratio, something we call low hood line.
I am 99.9% certain the new LS will be the best looking and highest quality car in class.
S Class interior is "rustique", exterior has always been a problem IMO, with their "slug" hood-roof-trunk line, and now additionally a fake anti-wedge design line that ruins the whole Mercedes portfolio.
7 Series interior is just a "luxed"-up 3 Series interior, with metal buttons and fancy bling interior ambient lighting. Exterior is proportionally and stylistically the worst BMW 7 Series ever IMO. Unsophisticated headlight-grill connection, non-stylistic "hockey-stick", high fender to wheel ratio with dropping rounded nose, trunk at a visually lower horizontal level than hood making it look anti-wedge, front-heavy and unbalanced. Adding to that is the unbalanced roof line, that tries to melt in the trunk, making it a "wannabe" A7, IMO the worst invention (A5 Sportback, A7, Panamera) VAG came with, that is also nothing new when you look at the old french cars that had this decades ago (Renualt 20, Renault 25, Renault Safrane, Citröen XM,...). From the BMW Vision Future Luxury, the 7 Series took the worst styling cue, namely the two-type shoulder-line-to-wheel-arch-connection, where at the back there is a crease between the shoulder-line and the arch (sensual looking), and in front it is flat (brute looking). Taillights are BMW generic.
Best thing is that the new 5 Series will be just as bad (it is actually sad), the worst thing being what I would call "double-unconnected shoulder-line".
New A8 will come out soon, but as usual the ugly FWD proportions (which I wish Lexus would also kill in the NX and especially the RX). Exterior is again the same boring thing, but more than that not even good looking. Of course (thought I'm not that sure because I didn't see it), it will have for me the worst Audi design element, the swoopy shoulder line, the slight curve or arc over the wheels (see A5). If the car anyway is boring, why not just a straight line as VW does (see Passat)? Interior, whatever quality just is plastic, with lines and creases all over the place, though layout is clean.
New Panamera is just around the corner. At least this one can do something. Though I dislike almost ever Porsche front for their headlights that give them a frog face, there is not much else to complain about, except of course that is it a Panamera, that means "fat *ss". Especially now hat they whill have a wagon version (shooting break) of the Panamera, could they than have made a Sedan, similar to how Mercedes has the CLS and BMW the & GranCoupe? Dynamically nothing will be able to touch this Porsche, which can be considered a true sports car, now coming with AWD and AWS. Of course this also untouchable financially, if you want a good interior, you have to pay a lot for all the options and customization.
Quattroporte, which was my favorite sedan, with this generation became a total crap. Yes it has a good up-to-date V8 Ferrari engine, but it has no more transaxle gearbox that made it the best balanced sedan, no more that Italian design, now it looks like Korean car, and the interior is disappointing, especially when you compare it to what could have been, looking at the Ferrari GTC4.
Not that I forget the XJ, it should also soon be replaced too. I don't know anything about it. And I'm not much a fan of current one, especially the rear.
As for the LS, it would be really nice for it to come with a supercharged V8 as some thing, AWD and AWS would make it perfect, though it doesn't have to be a sports car, just look dynamic. But unfortunately it will not be that successful here in Europe, as any Lexus, because you know badges are worth more than gold, buyers would pick the badge on sh*t rather than the gold ingot near it.