I think, the market for high-priced japanese cars is too small in europe.
Noone would buy a japanese in the same price-range as an Audi, BMW or Mercedes.

What ?

The Lexus range reaches firmly into the Audi, BMW, Merc price range. A top of the range Lexus IS300 costs £31,000 without any options added and the GS430 £42,000. There are tons of Lexus cars on the road in the UK.

Toyota's Land Cruiser Amazon costs £45,000 and there are plenty of those around.