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.