I'd be interested in such testimonials, too, but up until now none have surfaced.
But given its loaded weight was about a full ton heavier than a Fw 190D's (5300 kg to 4300 kg) and it being overall bigger I reckon it to be less capable a dogfighter than its smaller brethren.
Even less so as there were (projected) Dora versions with the same propulsion as the Ta 152 variants.
So the formers had a better power-to-weight ratio.
I would have preferred these "hotrod" Doras to go against the Allied super-props.
With its exceptionally heavy armament the Ta 152C was more of a single-engined destroyer and, with its very high wingload, was not a good turner.
The Ta 152H however was equal in a turn/fight with Spitfires. Roll rate was lower though due to the long wingspan.
Unlike, say, the Russian air force, afaik the Luftwaffe did not conduct specific turn rate tests as that was never an all too important factor in German fighter combat doctrine.