Opinion? No my friend, that's not even close to being subjective. Out of necessity PvPers have to be masters at PvE in order to keep their murdermobile's up to date and relevant, engineering more in a week than most of you do in your entire piloting careers. At high levels, this is a requirement that never ends, week in and week out, unlike strict PvE where all you have to do is slap on enough shield boosters and let your turrets do the talking while you watch Netflix on the second screen. Or if your'e a trader just back and forth milk runs ad nauseum with no risk or upset to your schedule.
The amount of hoop jumping required for this engineering grind is substantial, as anyone who's engineered will tell you. That, and having to keep their finances up in order to offset massive credit losses due to constant ship destruction (my career insurance costs are over 1 billion and that's not considered high by any stretch of the imagination). Heck, even exploration is covered by the profession, as evidenced by all my friends who nobly embarked on the Distant Ganks 2 Expedition, the greatest aid rendering mission ever undertaken in the ED universe.
No, there's no doubt that PvPer's have to be excellent at PvE even if the only reason they do it is because they have to to fulfill their long term PvP goals; simply put, there is no arena of play that PvPers aren't more proficient at than non-PvPers.
Edit: dammit, now I'm all choked up thinking of all my awesomely skilled brothers and sisters of the gun!