For the past six days I'd screen shot battery battery & usage/standby every couple hours or so, particularly before/after a workout and just before bed when my watch goes on the charger overnight. Three days with my S4 on WatchOS5 and then three days with my S5 on 6.0 then 6.0.1.
Not counting battery usage during workouts, full day battery%/hour was:
S4 - 3.69%, 4.08%, and 3.12%. Middle day I was working outside away from phone and wifi a fair bit
S5 - 4.13% (6.0), 3.28%, and 3.56% (6.0.1)
That's an average of 3.63%/hour for the S4 and 3.66%/hour for the S5.
S4 in normal configuration, S5 also in essentially a normal config with AoD on, raise-to-wake on, background app refresh on (except a couple apps I never use), etc.
In fairness, my workout schedule was such that I didn't go for any runs with the S4 during this period - that said, I've not perceived any substantive difference in the S5's consumption during my outdoor runs, so I'll call it a wash at this point.
Edit - using Infograph Modular face with WeatherTemp, Calendar, Workout, Activity, and MyNetDiary complications.