The TK75 is a general-purpose light; the Olights are outdoors tools, for use in big spaces.
The SR95 doesn't have a "low" low, or a thermal stepdown....it will blind you in a small room. But it will run for 3 hours on max with a large enough hotspot to allow you to recognize what's 500 yards away. "Low" is really just a runtime extender, the light is always very bright (SR95sut low is much more discreet)....
The Fenix is hard-pressed to show me what's happening more than 3-400 yards out (Teej has better eyes than me!).
Turbo is on a timer....you have to click back up. But it offers many more levels, some suitable for indoor use, longer runtime, and interchangeable batteries in an extendable configuration.
At less than half the Olight price, the Fenix is a VERY compelling package, and probably unbeatable for most folk's purposes.
I'm out walking through wide, dark spaces every night, with lots of critters...a growing wooded subdivision during the week and the Red River during weekends. I sold my TK75, and kept an SR95 and SR95SUT, and am thrilled. :thumbsup: