Here is a brief video showing three recordings using three different cameras of the same pianist playing his (unamplified) piano outdoors at different times of the year. Internal mics used for all three cameras. This enables you to compare both video quality and sound quality.
Sony HDR GW77V first, then the Panasonic ZS30, then the Canon EOS M.
Different piano pieces and different camera positions across cameras, so this is not a scientific comparison, but you can see and hear the different qualities. Only the EOS M has manual audio control, and records uncompressed audio. The comparison video was made using Sony Vegas Pro, so all original videos went through one re-compression (including audio). The video sent to Youtube was 108030p, AAC audio, 16-bit, 48Hz, at 256kbps. Select 1080p.
And here is a real video, of Washington Square Park in NYC, in which the pianist is at the end, shot with the EOS M:
Select 1080p. Includes the fountain, birds feeding close up, plastic man, flowers and bees, art, slow chess and speed chess (amazing), strollers, a guitar strummer, a squirrel eating a French fry, and the piano man, playing live.
Here is the Vimeo link, for better quality and original download: