Choosing a laptop with photography in mind

I finally found a store with a UX305 on display, and this machine’s display is beautiful! The construction of the machine seems pretty solid. There was a UX303 next to it (8GB, 1TB HDD, 1920x1080), but the display was glossy, could not achieve the same brightness, and was in general simply inferior.

How much of the SSD was left after installing Sabayon KDE? And after adding the rest of the above?

If you’ve tried any photo processing on it yet, how did it perform for that?

Thanks!