12 years ago I tore my right rotator cuff. I was shooting with heavy gear, sometimes as much as 15 lbs are more around my neck and , so it was no wonder that my shoulder muscles started to feel the strain!
My right arm ended up freezing on me and I had to work with my left arm only ,and was painting a mural at Scott Memorial library up till the day before surgery.
Department of Rehab , thank god, stepped in and paid for my surgery and saved my arm ! It was a very painful process getting the full use of my arm back with 4 months of PT and a full year to see 100% range of motion restored ! I want to thank Dr Morin for doing an excellent job on my shoulder and Dept of Rehab for stepping in, when I had no insurance !
Then, this March, the same thing happened to my left shoulder . I felt a sense of dread , as I knew what I was going to have to face again ! But this time I was to finally have insurance when I turned 65 on my birthday in July.  It was another rotator cuff tear and an impingement, but thank god, it was not yet frozen and so recovery would not take as long !
I had surgery October 23rd. I will have to wear an Immobilizer for 6 weeks and then 3 months of PT. 
I knew I could no longer keep my beloved Canon gear, that I have been such a loyal fan of for so many years. I started researching lighter cameras and was pleasantly surprised to see that Sony had launched a line of very light mirrorless cameras ! I decided to sell and trade all my Canon gear right away and and was excited about the new Sony system that boasted about a greater dynamic range and better ISO light performance than any camera on the market !
I decided on the new Sony A7Rll and the Sony A7S ( as a back up ). 
It was rough mailing out my Canon gear to new owners, but I was excited about the new lighter gear which I knew I had to adapt to . As soon as I held the Sony A7rll in my hands with the amazing sharp Sony 55 f/1.8 lens and started shooting with it, I was in love ! I tried it out ,on some portraits of friends, in low light situations and was immediately impressed with the great shadow details and how the highlights were never blown out ! The little 55 lens was the sharpest I have ever used and the focal system of the Sony camera was spot on ! I love how I can now set the camera to focus only on my models eyes and it will nail it every time ! Sony also has a great manual focus system with manual assist using color peaking and a magnifier to really see what you're focusing on !
The older camera , A7S also has a lot to brag about ! Even though it is only 12 pixels (all I need) it has the best ISO performance I have ever seen! It is pretty darn magical if you ask me ! Low noise way into the thousands ! I love the ability to shoot in very low light and still have a clean image!
Both cameras, I chose, weigh at least half what my Canon 5DMKlll weighed and the lenses are tiny compared to Canon glass !
I was concerned that such light gear could never deliver the quality I am used to, but I have been blown away by the images I am capturing with this new technology ! I think this is where we are headed in digital photography and Sony is miles ahead of the Nikon-Canon market, which  I never thought I would see happen !
Sony also has an adapter so Canon lovers can still use their current lenses ! But I decided to go 100% Sony and get full use of the lighter Sony Lenses and give my neck and shoulders a much needed break ! After all , this is my life and my love, I have no desire to ever give up this career or this way of expressing myself !
The question  has now been put to rest! Size does not matter ! These little cameras truly carry the same punch or greater, than any DSLR out there !
I have had a few clients question my new gear, concerned about how I can possibly get pro images out of something so 'cute' as these little cameras. But then they see the final product, all fears are put to rest!
I was lucky that Sony developed this new technology right when I was needing it! I am so thankful that it all came together at just the right time for me ! There is no looking back ! I am now a faithful & happy Sony user ! Thanks Sony!!