I have several Yashicas and a handfull of Canonets. I like the Canon for it's parallax compensating view finder, nice small size and ability to go full manual. Having said that though... The Yashica is a better Camera. The metering is really good, I rarely ever have a bad frame in the whole roll that wasn't my fault. The lens is amazing and the viewfinder is huge and easy to see. I carry a camera with me everywhere I go and have over a hundred to choose from but the Yashica is usually the one I have with me.
Just my two cents