Yes, since I switched to Canon, I have had to endure heavy cameras with heavy lenses. I have accepted the extra work with pleasure, the reward is in the final product. However, I just realized that some of the pulled-muscles, back-aches, side-aches, neck-aches may have to do with the heavy load I endure. For instance, for 15 days,during my vacation, I carried the 5DII plus the 24-105/4 from my R7 over my right shoulder: I developed a pain on the left side of the hip. For the combination 1DIII+Sigma 120-300/2.8 OS, I have to carry the set either on my right or left hand, or keep changing. After a while. I cannot hold it anymore. The one that causes less trouble is the 7D+ 400/5.6. In any case, I am getting pains all over, and spending time at the massage parlor, or chiropractor. I never had this before. After three or four days of break, I decided to take my Pentax K5 with a 50mm/4 macro for a walk. It is not heavy, and I put the strap around my neck! No good, I felt the neck pain, and then when I bent to shota flower, I had a backache. I just turned 60, but I have excercised all my life and have no medical issues. I have the feeling it is the heavy Canon. My co-worker got a hernia and his wife blamed his Canon set up (he did carry the whole line). He finally sold every Canon lens andcamera and moved to Leica. Has anyone felt the same thing?