Satisfied Canon user here. My take is that there are far too many folks on the forum who think technology makes the photo. They are more concerned with test results, sensor comparisons and all the technical information that is on the web. Test results show that other sensors are better, therefore Canon sucks - is the basic thought process. They are obsessed with noise and DR. Many of us who spent many years with film admittedly don't get it. Photos can be grainy - and quite frankly - often look better grainy than having the plastic-smooth overly processed look. More DR means less contrast - yet contrast could be considered more important in the eyes of many. Folks want more MP, and yet on at least a few websites, reviewers note that without a tripod, there is no difference between 24 MP and 36 MP. And, yet, people want even more MPs! Unless you print larger than 8" x 10" there is virtually no difference between photos taken with an SL1 with kit lens and a 6D with "L" lens, but people want to believe that they need the best cameras and the best lenses. (In fact, at 8' x 10" printed size, there is no discernible difference between pics taken with my old Canon 300D and my new 6D). So if a Sony sensor tests as being 10% better than the Canon sensor, then obviously the Sony pics will be so much better...although you probably won't be able to tell the difference purely by eye!
A good photo is the result of subject matter, composition, atmosphere, contrast, color. And yet, it seems like those topics aren't even considered by many. For them a good photo is judged by the amount of noise and the Dynamic Range.
All that being said, there are some folks you take pics in extreme conditions - very low light, astrophotography, etc. For them, the difference is meaningful and I can understand their frustration. If Canon doesn't meet their needs they should switch. There is no reason to think that Canon has the knowledge (or the ability to come up with new patents that don't infringe on Sony's patents) to substantially improve their sensors in the near future. But if all you need is a solid, dependable camera that will last you 5 to 10 years and take great pictures, then there is no reason to be disappointed. If you want the latest and greatest and want to upgrade every two years, then by all means, switch.