I currently own both a 2017 McLaren 570S and a 2011 NA 6SP Evora, hot hodded with a full Header System, wider wheels and tires, and other modifications.
I bought both cars NEW, and Love BOTH cars. They are very similar in many ways, and different in others.
The "Curb Weight" of the 570S at 3,186 vs 3,120 Evora 400 are very comparable.
The 570S is 178.3"L, 82.5"W, 47.3H, while the Evora 400 is 173"L, 73"W, 48"H
The obvious difference is the 562HP of the 570S, vs 345 for the Evora S or 400+ for the Evora 400 / 410 / 430.
As noted in many reviews, the Stock 570S is WAY under-tired with 225-35-19 and 285-35-20 tires, while the Evora 400 has 235-35-19 and 285-30-20 tires. (My Evora has 235-35-19 and 275-35-19 tires.)
I have driven my 570S, my NA Evora, AND the Evora 400 on spirited drives on back country roads.
My experience is that the handling seems similar between the Evora(s) and the 570, other than that the 570S launches out of the corners MUCH faster. I have sensed NO nervousness in the 570S in the corners. On very twisty roads, my 570S feels a little larger, probably mostly due to the width.
I tend to drive my Evora more on spirited tight and twisty back country drives, but always wish for the 570S's HP.
I have NOT driven either car on the track, since I have a purpose track Sports Racer race car. I have had an SCCA National License, have raced since 1975, and I have well over 1,000 laps around Laguna Seca in a race car.
So, I can say that Randy Pobst certainly looks comfortable and quick around Laguna in a Stock 570S. I don't see any nervousness, and a 1:34.5 is pretty quick, especially with those stock tires.
I could not find a lap around Laguna in an Evora 400, but this lap in an Evora S might reflect some of the Evora's handling characteristics. It is by the SAME driver, Randy Pobst. (PLEASE don't point out the glaring error of comparing an Evora 400 to an S; I get that.)
Addressing some of the other points mentioned in this thread.
New McLaren 570S's are frequently deeply discounted by the dealers. So, unless you are special ordering a "Build", you rarely pay MSRP. I paid WAY under MSRP for my NEW 570S.
570 discounts - Page 7 - McLaren Life
The exterior fit and finish of the 570S is a little better than the Evora, and the interior is somewhat more refined, but the Iris head unit in the 570S is far inferior to my Evora's aftermarket Kenwood.
McLaren also uses Velcro and Double Sided tape to secure trim pieces, and there are many build complaints similar to the Evora.
The 570S requires an Annual Service of fluid changes, etc. I have not faced that yet, but it is supposed to be around $1K the 1st year, and more in subsequent years. It looks like the 570S is more of a "bring it to the daeler for service" car than the Evora, which can be a DIY car for most maintenance. So, I expect the maintenance costs for the 570S to be considerably more than an Evora.
So, I'm NOT hyping either car. They are BOTH terrific cars that each have their own pluses and minuses.
I'm keeping both, despite my jammed garage.