Doesn't sound to me like OP is all that concerned with performance, and even pure luxury doesn't sound a huge priority (hence the -esque suffix).
G25, G37, or IS250 sound like the ticket to me. Only the G37 is fairly quick, but the others are fast enough to putter around LA in (not like there's a lot of opportunity to see much speed in that area to begin with).
Better reliability, cheaper, still nice entry-lux comfort/features, and they're not really any less presigious badge-wise than entry-level BMW/Audi/Mercedes.
If OP is only leasing for a couple of years before switching to some other new vehicle, and doesn't care, then my #1 advice is to just go test all the candidates and see which one 'feels' right.