I had the Rx7 and the turbo added a boatload of power over the non-turbo version (I've had several of both) but living with it on a daily basis was.... brutal at times. I was convinced it didnt actually have springs on it, just well placed chunks of concrete. I replaced them with the springs off a non-turbo plain-Jane base model and it became a whole different car, much more liveable. I dont really think it gave up much in handling either, though I never ran any laps to test that. It was a great car, but it did have some quirks. I'd like to get another, but it wouldnt be a daily driver like last time.
My friend had the 300zx and it was one fine car, easy to drive and comfortable. Never got to drive an Mr2 turbo, just a non-turbo. I'd love to be able to find a decent condition example of any one of them and add it to my harem, but around here at least, they are turning to rust, or they are owned by younger guys who have beaten them to death or butchered them with rediculous mods. The few fine examples still left, and there are some still out there, are getting decent money.
That was a great era for sports cars....