Did some digging...
1995 J30 MSRP ~$40k1995 929 MSRP ~$36k
Differences?929 is larger, J30 is slightly quieter, both produce the same amount of power. J30 is 3550lbs, 929 is another 100lbs on top of that.
J30 0-60 ~8.9s.929 0-60 ~8.9s.
I think the J30 wins for smoother engine and plusher interior, while the 929 gains a little bit in size.
They both offer smooth flowing dashboards and analog clocks. Back seats are smallish in both.
Why are the two even comparable? The 929 and Millenia were originally going to be sold under the Amati brand, until Mazda realized it couldnt afford it, was late to the game, and lacked a unique luxury product offering.
A 1995 929 can be had for about $3700. A 1995 J30 can be had for about $6700 in the same condition with average mileage (10k/yr).
Man, talk about sour depreciation on the Mazda. Thats what happens in America when you dont put a luxury nameplate on a luxury car.
Both are a royal pain to work on, but at least transmissions and engines are readily available. 929 uses a Jatco transmission with a similar V6 used in the MPV. We all know about the J30's sweet V6.
The 929's transmission in the early 90s had a reputation for being weak, along with the J30s. A transmission cooler and annual flush/filter change makes a difference between failure and reaching 200k.
The J30t of course is different, and there's no comparable model with Mazda.
Edmunds and Carpoint readers give both cars about the same extremely high overall ranking, 9.something.
From what I've read on forums, and my own forum, both are extremely rewarding to own if you take basic care of them. But in the real world, you can acquire a used 929 for half the cost of a J30.
The J30 is the belle of the ball. Everyone wants them, knows what theyre about, and admires them. When a J30 pulls up, you know it, recognize it, and instantly conjure up memories of Johnathan Pryce leaping around in television ads. And then you think of its powerful V8 sibling... the Q45.
The 929 however is a forgotten automobile that doesn't fit Mazda's new sporty image, and Mazda wants us to forget it existed.
Rumors point to a Mazda9 coming in 2006/2007.
Not sure anyone cared about all that, but I love automotive history.
-Jesda