There have been some comments and questions in the RX10/etc threads about lens hoods and filters, pros and cons of using protective UV for example. Over the years I've done many tests and used hundreds of lens types, and also (probably) hundreds of filters though my best UVs have survived over 30 years. My worst UVs have lasted a day.
I generally don't use any lens long-term, outside the studio, without a permanently fitted filter. Today you can buy filters such as Sigma DG (which in comparison tests I've done prove to be equal best with the very top level Hoya Pro 1 Digital or best B+W MC