You were shooting just jpg?

To see if there is a difference save in both file formats, RAW and JPG and compare your RAW processed results to your old method.
I am assuming without looking up your cameras manual that you can save in both.

Do you not use DPP that was provided with your camera?
LR6 is a big leap up from DPP IMO, LR5 would be a big benefit as well if you could find someone that upgraded to give you there old version.