Another question for Paul as the S5 guru - how do you find the Panny high-res modes, if indeed you've used it? Most reports suggest it handles image movement a little better than Olympus versions , just wondering if the 80mp landscapes come out with better detail and colour tones than a standard 24mp shot?
I've used it a few times. It works very well, but of course you need the camera on a tripod. With the option to remove subject movement it does a decent job even with a lot of movement in the frame. My assumption is that it's merging extracts from a single frame to stitch into the areas of the hi-res version where there is movement. It does it very well - I really can't see the joins (so literally, seamless).
But I'm not really into really hi-res images. They chew up huge amounts of disk space and only really deliver a benefit when you go pixel peeking. I usually size my Flickr posts to 4000px longest edge and for printing, 24Mp is perfectly fine for even really big prints.
When I had my EM1.3, I used HHHR from time to time, but I used it as a way of improving shadow noise so that I could expose for sky and then push later in LR. With the S5, I can do that without the need for stacking.