[unknown] Nothing has changed. If all you care about is visual quality and bandwidth/file size doesn't matter, then the full-size original is still the best option.
Though usually (at least for me) the difference in visual quality between the original and the "max" 6k/5k/etc version is not a whole lot, personally I just download the original version for my absolute favorite scenes.
Keep in mind you might need a slightly more recent/powerful GPU to handle some of the full size originals due to their much higher bitrate.