Nice control and tone, but in all honesty, I found it boring. It sounds like a nocturne and completely lacked the improvisatory feel of...well...an impromptu. I think it would be a lot better faster and more off the cuff. I think your interp. was perfectly acceptable...these comments are just a reflection of my personal taste.Cziffra's Tokyo performance:https://s6.yousendit.com/d.aspx?id=3RYJ0ZFRQBBFJ1U8R9XWFHD9QG
I would agree with you if we were talking a Schubert Impromptu, but I think Chopin's just aren't harmonically interesting enough or just plain good enough to be played as "deep pieces". Again, personal opinion.