You won’t find a single original 4 player cab with angled joysticks.
Before making an absolute claim like that, you may want to look at the Captain America & the Avengers flyer
here. The bolts on P4's stick are clearly angled.
There was some disagreement on
this list by DM, but you might be able to confirm/disprove using flyers because companies aren't likely to use crappy conversion cabs in an ad.
You can also add the much-maligned 2-player titles Virtua Fighter and Virtua Fighter 2 to DM's list. (image from VF2 manual)
Shponglefan understands this ongoing discussion.
Seriously, why do you guys care so much what people do with their own arcades in their own homes?
Bottom line: A few cabs came from the factory with angled sticks, but the vast majority,
including the most popular and well-received titles,
did not.
Scott