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As no-one has commented, I just wanted to say thank you for posting such a detailed test - very interesting.

I've been comparing my 2011 Air (13" i5 128Gb) with my 2011 mini Server (256SSD (Apple/Toshiba), 750HD (Apple/Hitachi), 8Gb ram) using the Photoshop Speedtest: http://clubofone.com/speedtest/

Using their recommended settings I get:

Air: 29 seconds
Server: 17 seconds

If I bump their test file up to 80 megapixels I get:

Air: 15 minutes
Server: 3 minutes

I'm about to swap the mini Server for the mid-mini with AMD graphics, and this test has persuaded me to get 16Gb of ram. (That said, it's quite possible I've misinterpreted the results :))
 
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