Nothing keeps up with the miata in the turns except the little Lotus Elise.
And a Morgana 4+4, Lotus Super Seven, Lotus Elan, Lotus Europa, Mini Cooper S, Porsche 911, 912,914, more expensive 908, Triumph TR7, Donker Voort GTO, going back to more vintage types, considering the ability to carve corners, the Austin Healy Bug Eye, an MGA, the MG-TF and TD.
Certainly, honorable mentions, the Opel GT, Alfa Jr., Audi 3, Audi Quatro, Peugeot 205 GTI, Volvo P1800 and hold on to your hat, the VW Karmin Ghia!
I've forgotten some of the other "open wheeled" vintage sports cars similar to the Morgan, the Super Seven and the Voort GTO, MG-TF/TD as these cars placed the wheels outside the main body covered by rolling fenders and running boards, like a Formula car with fenders. This allowed the front wheels to have a greater turning radius turning sharply without hitting inner fender wells of full bodied cars. The Super Seven is probably one of the fastest cornering sports car built for the street and would compete with the Ford GT, Mcclearn and the European exotics.
As to the best corner carving street sports car, not being familiar with all the late model offerings, my vote would go to the Lotus Europa in a full bodied two seater class, the Lotus Super Seven taking first place overall.
But, the Miata certainly belongs in this group of carvers, I really enjoyed mine.