In 1990, the first Miata I got to see up close belonged to my friend Miq. At the time, I was driving a 1971 MGB as my daily, while working on an E Production MGB for SCCA competition.
Miq drove up to my house in his Miata, so naturally I parked the MGB next to it. The underside stampings were very similar in look and dimension, with similarly-placed longitudinal stiffeners in both, but of course the Miata's PPF and IRS were very different.
From above, though, the two cars had remarkably similar proportions. Length, height, and ratio of bonnet to interior to boot were within inches of one another, though the Miata's windshield was considerably higher than the al-you-minnie-um frame on my MGB's windscreen.
Then we looked at the cars from the front, and the Miata was a good ten inches wider.
Miq and I took his Miata to Crows Landing for an SCCA autocross, which would be the first time I drove his (or ANY) Miata. Miq took it out for the first run, then I hopped in for mine, helmet in place.
I turned the key and was subjected to a hideous grinding sound. Miq leaned in and yelled through the helmet, "YOU DON'T HAVE TO START IT IF IT'S ALREADY RUNNING." Note: stock exhausts are very quiet.
The starter waved me on course, where the first corner was a tight left-hander. The Miata (on Yokohama A008Rs, the hot ticket back then) turned instantly without complaint.
"Wow!" I thought. "This thing handles better than my race MGB!"
Next corner, a fast right. I turned down as I would have in the EP car --
-- and center-punched the cone, just inboard of the right-side pop-up headlight.
"Only it's about a foot wider," I reminded myself.
My fastest lap in that car, the third time I had driven it, was sufficient to put me in second place in class, behind the driver of a Porsche 924S who would go on to win his class in Salina that year.
Our next outing in Miq's Miata was at a Fiat Club autocross at the Pleasanton Fair Grounds. Despite a spin in my third run, my best time was enough to take first in class. The trophy was a digital stopwatch with a brass plaque engraved 1ST PLACE under the readout.
So naturally, I went out and bought a Miata of my own... seventeen years later.
THAT Miata, a 1996 set up as my track day and autocross toy, was the first car I'd driven at Laguna Seca (for the 20th Anniversary celebration) since my EP MGB. And I had almost the exact same reaction first time through the right-hander at the bottom of the Corkscrew, when I had to jink left to avoid taking the Zanardi Line through the dirt. The Miata just hooked up better than my old Production Category MGB, even though I was on sensible Michelin all-seasons, more suitable to the Portland rainy months than to fast laps.