This one was actually out the window of our 4-runner. We were in the mountains headed somewhere else when he popped up. We try to follow the rules with wildlife, try not to bother them or approach too close. We spend 4 or 5 days a week in the mountains photographing wildlife, we have learned what works and what doesn't.
Interesting, many times you can do well from the car. For some reason, wildlife will often hold for a car - but will spook if someone gets out with a tripod. We always have a couple beanbags handy (and remember to kill the engine to reduce shake).
Here is another of the same bear - non are cropped, they are as shot. Sometimes it can be a challenge to get it all in!
As far as gear, I love the lens. The 1DX Mark II is still new and I have to say, I'm not really a fan at this point. The metering seems to be off - these images were both shot -2/3 - seems everything needs to be shot around -1. I think it is a individual camera issue, not an overall design issue. I have friends with the same body that don't have the issue. Canon asked to see the camera so it will be going back next week for a checkup!