CC does have a couple of new "killer" features over 6, if you use them. In order of what I think is the better usefulness/utility of those features from trying the trial, you have RAW panoramas, and also RAW HDR, which gets you in the case of panorama a 16 bit DNG file of the merged panorama. I tried it against a couple of panoramas that I had previously stitched in PSCS5 using the Pano tool. I found the RAW version was much better at it than the PS tool. Alos where there were moving objects in frames it was very good a producing a final result that removed them where possible, something that PS singularly failed to do. One of the images that I did was compiled from a multi row handheld pan, with IIRC 64 images. I have not used any of the other pano stitching programs, so cannot compare with those. The RAW HDr gets you a 32 bit DNG, I didn't try that one. CC also gets you the upright tool which is reckoned to be very good too, I didn't really try that out, It's a bit hard to "upright" a shot of an aircraft in flight with only sky as a background, and it was my aviation images that I was mostly using to test the software. The other tool is the camera shake correction. I have seen some positive comments. I had hoped it might be of help with the aircraft shots where there was a little under/over panning, but it seems that it wouldn't play like that, It may require that the motion is only in the vertical direction, as you might find in camera shake. Again I was trying to use it on aircraft against a plain sky, so was at least hopeful. Adobe dose though say that it won't correct for panning, so I was pushing my luck. [IMAGE'S LINK: https://flic.kr/p/ew8nKs]Avro 716 Shackleton MR.3, Handley Page Victor BK1A
I'm still on LR4, the basic processing engine in LR4, Process Version 2012 is still current in the latest CC version, it's just the additional tools, and extra camera profiles that you get with the later versions. Your 1D IV will be supported by LR4, but I think you need to go to 6 I think to get native support for the 6D. Of course thanks to the Adobe DNG converter, which is a free download, you can convert the CR2 files from a newer unsupported camera to .DNG's that you can use in the older version. If I were to do that though I would still keep the CR2 files, and back them up. Converted DNG files are not always 100% compatible with non Adobe RAW conversion software.
Figured I might as well show the example of the pano stitching. First is the "original" version done using PSCS5, with several hours of mucking about to try to optimise all of the layers. Considering it was shot handheld I didn't think it was too bad. The original PSD is 13520×7638 pixels cropped to 10356×6836, then exported to JPEG, As it is an older post on Flickr, it is in the old POTN size of 1024 on the long edge.
by Alan Evans
, on Flickr
The DNG version was a simple run through to set the global conversion parameters for the DNG file, as I would do for any image and included cropping/straightening. The original DNG is 13287×7630px and it was cropped to 10340×6894px, and was then exported to Flickr in the current POTN size of 1280 long edge. Total processing time about 10 min. [IMAGE'S LINK: https://flic.kr/p/FjFVb5]Avro 716 Shackleton MR.3, Handley Page Victor BK1A
by Alan Evans
, on Flickr
I'll leave you to judge. The other two pano's that I did this with also showed significant quality improvement thanks to doing the stitching with the RAW files.