Please show the objective rules that could be used to identify "idiomatic Java" and "idiomatic C#". Please show the objective rules to direct how comparison sh

Please show the objective rules that could be used to identify "idiomatic Java" and "idiomatic C#". Please show the objective rules to direct how comparison should be done when one languages "idiomatic" is not the same as some other languages "idiomatic" — to avoid you can write Java in any language.