Your right, if it was more weather sealed I would feel more confident to use it in more extreme conditions, but I used it on the "Snow Monkeys" in Japan at Nagano in December, snowed an absolute bitch & the temperature was well below freezing, on the 1Dx the Lens performed a complete treat.
You used the 85 1.2L II in snowing and freezing conditions? Are you aware that this lens is not weather sealed? Why are you not confident about the lens if you did this? Does it still work?
I dare not take mine outside sunny and dry conditions.
Yes, I was aware of the issue of the Lens not being weather Sealed, but for me the Lens/Camera is a Tool, so it's about risk, if it had been Raining I may not have considered the risk acceptable, and used the 70-200f/2.8 II, but in this situation, with the Snow Monkeys, it was heavy Snow, below freezing, so the Snow was tending not to melt on the equipment, and it worked just fine, the Lens performed well & I came away with some Images I was Happy with & the Lens with a clean up, still works just fine, appreciate the concern.
The confidence part comes into Play only in the degree to which the particular Lens is weather sealed (also consider dust), if it's a known sealed Lens such as my 300f/2.8 L IS Version 2, I'll simply use it in any & all weather/dust conditions, if it's a known Non sealed Lens, then it becomes a risk/confidence of survival situation, I'll generally though err in favour of the Image as a Lens can be bought back from the Dead after water immersion or dust issues, not so a Camera, which is why I use a 1Dx/1DMK IV with a 5DMK III as a fall back.