It is a great camera, so easy to use and so versatile. It does have its weaknesses. mainly being its inability to obtain very sharp focus at full zoom and often inaccurate exposures.
I'll write about the new lens first. I chose it because it seemed to be the best lens for my budget. It got great reviews for its sharp focus which was my main consideration. It is very sturdy, and very heavy.
I chose the Canon 6D body because it is a full frame DSLR; 20 megapixels with a slough of features that I will never use.
Its main competition in my thinking was the Canon 7D Mark ll. The 7D is an aps-c type of camera. In my ignorance I assumed that the full frame CMOS sensor of the 6D means a better quality image. I already know that is probably not the case. I should have gone with the 7D because it would have turned my 600mm lens into an 800mm lens. By the way my old HS-50 has a 1000mm zoom lens.
My preliminary impressions are that the HS-50 is 40% more powerful than the Canon and so much easier to manage. However the Canon does a much better job of getting exposures right. It is too early to know if the lens sharpness is significantly better, The Canon has 20 megapixels compared to the HS-50's 16 megapixels.
The Canon will never replace the HS-50 entirely. I will have to use the Canon more before I decide whether to put it up on ebay or Craig's list. My hope is that some camera manufacturer will come out with a superzoom point and shoot with truly sharp focus. Then it's goodbye to heavy lenses.