Just a word of warning to anyone who doesn't have a 5 yet. Photos like that are misleading. All you are proving with your low light photos is how the watch backlight appears in a photo (which is not at all how the lighting will appear to the naked eye). A low light photo is going to blow out the brightness no matter what you do. For example, take a picture of your television or LCD/LED monitor in a dimly lit room and then compare that photo to how the screen looks to the naked eye. See the dramatic difference in how the backlighting appears? That same effect is making your "no light" watch photo blow up the brightness to an unrealistic degree. I get that you are trying to help, but you might consider adding that disclaimer to your photos.
As has been discussed repeatedly here, the 5 is noticeably dimmer than the series 4 in the same "active" face scenario. That's just a fact. Now, if some are okay with the dimmer setting then that's great. Personally, I wouldn't try to convince others that they should also be okay with it by using photos, but that's just me. A photo might be more helpful if you wore a series 4 on your wrist alongside the series 5. I mean, neither watch would accurately convey the lighting in real conditions but at least you could see the difference between the two models and that would be a good thing. ;)
Anyway, the much dimmer active watch face was the problem I had with the 5 and the sole reason why it was returned. For me, I didn't feel like spending several hundred dollars for a watch that ended up being a lot dimmer in the scenario I cared most about. Just my two cents. Now, is the 5 still usable in low light conditions? Sure, absolutely it is, but it's also undeniably dimmer than the 4, for obvious reasons. With an always on watch face Apple need to manage the brightness more aggressively using the new ambient light sensor in order to reach the same battery life numbers as the series 4. Makes perfect sense. But again, for me, I decided I would rather have a brighter screen. I'm not here trying to convince you or others here to agree with me. If the 5 is bright enough for you or anyone else then that's just great! ;)