Ferrari is benchmark of/for all sports cars.

[B45]

Ferrari is benchmark of/for all sports cars.

Are both okay?

 

[charliedeut]

I'd say it is "the benchmark of​ all sports cars".

 

[Champleon]

I'm not a teacher.

Ferrari is a benchmark for all sports cars.

 

[Matthew Wai]

I'm not a teacher.

Your profile says you are a retired English teacher, so you don't have to say it.

Not a teacher.

 

[MikeNewYork]

I'm not a teacher.

Ferrari is a benchmark for all sports cars.

I too would use "for", but I would use "the" if the writer believes Ferrari is the best.