Another point in question is the simple fact that every camera is different. I started off with the Olympus E1 which was fantastic, but it was also only 5 million pixel.
To get enough quality to match top 35mm you needed to shoot in RAW. I used it for years. Then the D300 was born which became a giant leap forward. Even JPGs were better or as good as medium format. Not only that, but different cameras can produce good or not so good JPGs. The D300s are not bad but RAWs are notably better.
The K5 can produce great JPGs which are more than just usable. Things have moved on. I am a full time pro and I shoot and use both. If i was not a pro I would prob not change much. I would likely shoot in RAW. Thats simply because I simply get enjoyment from getting the best out of my images though. The truth is, thats a bit sad in many ways lol. When is enough enough ! How much quality do we need in reality. There would still be those thinking they are better because they shoot RAW if they were shooting a camera with 100 milion pixels with every lever of DR lol. JUDGE THE PICTURE AND NOT THE METHOD
Use whatever works for you.