Back in 1996 (egads) I remember seriously considering these rides new and used in no order..
Mitsubishi Diamante
Nice car.....solid as a tank, and, at the time, IMO, significantly underrated in the American market.
Mazda Millenia (would have been the car but the 2.5 was dog slow and the upgraded engine was out my price range)
You're probably already aware of this, but, if not, the FWD Millennia was originally developed as a potential Lexus ES competitor. It was to have been the first offering in North America of Mazda's then-proposed Amati luxury/upmarket division. Ford, however, who owned a controlling share of Mazda at the time, didn't quite see it that way, cancelled the Amati division, and, with no place else for the Millennia to go, it ended up being Mazda's new flagship sedan...replacing the RWD 929.
The Millennia, however, never sold well in the U.S. I test-drove one, but I can't remember if it had the standard engine or the Miller-Cycle one. A nice car, with the typically sharp Mazda handling/steering, but I didn't think the overall build quality was as solid as the Diamante's. The Millennia I drove, brand-new, had several creaks in the dash and body-structure, and the interior trim, IMO, didn't quite seem what it should have been for a flagship.