I couldn't find many benchmarks for the optional 7200rpm hard drive from apple. So here are the screenshots of the disk speed. (fresh install of mountain lion).
and Here's the benchmark for my new samsung 830 SSD (256GB)
Side-by-side Comparison pictures:
The SSD is much lighter and thinner.

and Here's the benchmark for my new samsung 830 SSD (256GB)

Side-by-side Comparison pictures:


The SSD is much lighter and thinner.