No idea what 35mm is all I know is that 1080p and 4K is good videoA camera has a much better battery life and a spare memory cards and batteries are easier to find and to fit "in the field". If I was going trecking I would seriously consider going back to 35mm.
Not quite as easy as that. The type of sensor plays a significant part. For example a 12mp full frame sensor will have better noise and low light capabilities than a 16mp micro 4/3 sensor. You can also have the best sensor and highest MP but if you have poor lenses it will not be as good....but know very little about cameras other than MP is good