I've been playing open for ages - but, it's been in a relatively low-population area of space.
Recently upgraded to a Viper and went to Leesti to do some bounty hunting at a res. I found a place that was very active. Lots of high-bounty pirates, lots of system security, and a couple of other players. One in a vulture, another in e Fer-de-lance.
Then the guy in the Fer-de-lance started ramming me. First one I thought was an accident. I realized the second one was intentional. I tried dodging the third but failed. At that point I had no shields and 26% hull, so I figured I'd boost out of there and get into super-cruise.
As I was charging up to super-cruise, the Fer-de-lance decided to open fire and finish me off before I could flee.
So yeah. That's my first experience sharing combat space with other players.
I have therefore swapped to Solo.