HPC performance with Arm compilers

Hello,
I was wondering if anyone has any sharable experience on performance for HPC apps built with the arm compilers versus GNU or other compilers. My interest (at this point) is simply in compiling & building, not in linking with external optimized libraries or profiling tools. Obviously, it's going to depend on several factors but it'd be very helpful getting a ballpark about potential gains from switching compilers.
Thanks.

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