Sorry, but thats a ridiculous statement - even from the cars mentioned in this thread an M6, Maserati, 911 and a Mustang are all totally different experiences, even my current 4 seater is capable of performance very similar to a GTR but delivers it in a totally different way. You dont have to drive everywhere at 10/10ths either ......... which is where the GTR falls down for me, its doesnt feel special when doing 45 mph like a Maserati does.
^^^This, in bucketloads.
Anyone who thinks that having driven a fast car makes other cars seem rubbish is talking bobbins. The F12 is about as fast a road car as you're likely to reasonably have a chance of driving, and I can promise you that in no way do I feel hard done by when I drive our 182 now. In fact, there's many times I'd rather take the 182 than either my 645 or my old 911, despite being nowhere near as fast. I know, that's not exactly what you were saying and I've exaggerated the point for effect so I apologise for that, but the point stands.
The AMV8 just looks dated to me now. The Maser is still a head turner, and has a Ferrari V8. Given they're both fragile things, and neither are cutting edge in terms of dynamics, I couldn't look further than the Maser.