noone1:

Well, when you drive them, you'll know that you're incorrect.

The 12C performs almost identical to the 650S, and on a track with the same tires, the differences are minor at a best. In the real world, difference are even smaller. There are even lap times where the 12C Coupe is quicker than a 650S Spider. When 12C owners tested the 650S, many didn't think there was much difference.

You can go to fastestlaps.com and compare 650S vs 12C, and 650S Spider vs 12C. You'll notice there difference is negligible.

Don't know why you're calling the 488 a facelift to the 458. It's not even close to a facelift. It's a completely new engine for starters, with 60hp and 160lbft more than the 458 Speciale. When have you ever seen a facelift with a completely new engine design and 60hp/160lbft gain?

How could the 675LT be the rival to the 488 Speciale? It will have been out of productions only a year into 488 sales. P11 came out in 2011, 4 years before the 488. 675LT is P11. In fact, if stuff brakes on your 12C, you may wind up with parts from the 650S or 675LT.

12C/650S/675LT are all very similar. They never made Trofeo R for the 12C. Stick some Trofeo R on the 12C and watch how close it gets to the 675LT,

The Porsche 991.2Smiley.

Now, back to the 458/488 and the 12c/650s facelift. Chris harris did a video when they first came out with the 650s and he went over what was different between it and the 12c.  They changed the suspension and gave it the updated version, more downforce, latest gen of CCB's, revised cylinder heads, new pistons, revised timing, new exhaust system.

Im having trouble finding the difference between the speciale and 458, but so far what I'm reading is all about the tires, SSC, brakes, weight, softer ARB's, retuned Magna dampers, stiffer springs, and "aero".  I couldn't find Harris's video on the 488 since his was the most detailed version, so I'm going to have to scavenge what i can.  The 488 had retuned Magna dampers from the speciale but with a softer mapping, SSC2, the aero, laf-sized brakes.  

So if you compare the changes from the 12c to the 675LT, you would get all of the changes from the 458 to the 488, if my sources are right.

Edit: it seems the BBC claimed the 488 video on copyrightSmiley.