I’m struggling. Agree with Porsche as long as the spec is right and Ferrari are up there, but then it gets difficult. Mercedes are a lot better than Audi or BMW at the moment, but the droopy CLS and A Class hold it back.
It's seems almost impossible for anybody to have a good range, as the desire to stamp the "corporate look" on everything will never really work. For what might work on the flagship of the range may look stupid on a smaller car or vice versa. This seems to be the trap that BMW, Audi and Merc have all fallen into. So the ranges that are most successful are probably those that don't slavishly follow a corporate look.
I think Land Rover are coming close, with the notable exception of the Disco 5 - the styling of which as a blown up Disco Sport with a wonky back end has always never quite worked. But their range in general works as each Land Rover product looks just different enough to the others to have its own identity. Yes, at a distance you can confuse a Disco Sport with a Disco, or RRS with a Velar, but you can't confuse a full fat RR with anything else and you won't be able to confuse the new Defender with anything else either.
And coming in from left field I'm going to nominate Peugeot as getting there. They came from a dark place - the guppy mouth period. But now they are starting to look a whole lot better.
And yes, I do like the Jag range, but the XE and XF are too similar and the E-Pace looks a bit dumpy. I also preferred the sports cars when they had the oval grilles - the XK period. That clearly differentiated them from the saloons.
Not Land Rover, Gerry McGovern did the Discovery - Steve Cropley's favourite bloke. No wonder sales are sluggish, it just looks awful.
Land Rovers have the habit of looking worse as they get older. The current RR Sport looked fine when it launched, in 2020 it now looks chintzier and a mess. Same thing with the last RR Sport, it started out okay...
Ferrari. The Roma looks amazing, the F8 looks amazing (saw one in London last week), the 812 looks amazing. Big love.
The problem with Aston aesthetically is that they aren't at all bad-looking, but they are worse than previous generations. I suppose the final part of that sentence could apply to just about everything, though.