I've only had my MJ for one month but over Christmas period saw maybe 30 Panda's on my travels, I waved at most and recieved aknowledgment from about 6 or so. Most were Panda Active's and just second car / shopping trolleys, takes something like Sportings or 100hp for people to seem interested in their cars.
I have owned a few 2cv's and every driver waves to one another, probably in sympathy mind you!
My weekend car is an Alfa Romeo 164 24v and if I ever see another I always get flash of headlights, but thats because of rarity I guess.