Martin vs Sigma vs Gibson vs Santa Cruz guitars comparison - acoustic blues

0:00 - Sigma 000M-15 (000, solid mahogany top)
0:40 - Martin D-15 (Dreadnought, all solid mahogany)
1:22 - Santa Cruz OM/PWM (OM, mahogany/spruce)
2:04 - Gibson L1 Robert Johnson (small body, mahogany/spruce)

In my YouTube-Channel you will find more recordings with these guitars!
   / jackisidoreguitar  

The same piece of acoustic blues played on each guitar. The takes were not made at the same time, but it was the same room and the same high-end mic (Sennheiser MKH-50 P48). No further sound treatment.

You can easily figure out some characteristic differences: 000 vs dreadnought, dreadnought vs om, sigma vs martin,mahogany vs spruce top, and some typical sound characteristics of all mahogany guitars and of gibson smallbody blues guitars.

So is this an unfair comparison? The "cheap" Chinese Sigma vs the entry-level Martin vs the high-end Santa Cruz vs the mid-priced genuine Blues Machine by Gibson? Your opinions are welcome :-)