I think you have to tip your hats more to BMW, from whom they copied Chris Bangle for the W221 and the Lexus.
I think BMW had the most influence on the W221 and the new Lexus.
For example, when the E65/E66 came out, it was the first car that was part of the large luxury sedan segment to feature "controversial looks" at the time. It had a fat butt, pronounced wheel wells, a high shoulder lines, and the rolling, kind of hatchback like C-pillar and short trunk.
Here's a picture comparison I made for another thread.
And down the line through history, BMW also has influenced other car manufacturers in terms of design cues.
For example, do you think Mercedes would have thought of circular headlights if BMW hadn't thought of that ages ago? It's been their trademark since they moved away from airplane engines to cars.
Even Lexus had influence from BMW...If you look at the new GS, they stole the "hofmeister kink," which has been around since the 1961 BMW 1500. the "hofmeister kink" is an angle at which the window takes at the C-Pillar.
Those are just a few examples.