JP makes up for low pen with good accuracy and spitting out great RoF. Also you forget outside of Pershing and is-2 there's not really anything it can struggle to pen anyway.
Churchill's while they will bounce the odd shot are just big vet sponges for the jp.
Jackson I would say is a poor comparison, it's mobile, not 60 range and the turret doesn't move so slow. I think the firefly has a one armed dwarf cranking the turret, so it fairs a bit better on urban maps than FF or JP
1.
- all KWs have high armor/ hp/ dmg reduction
- SU152 have high Armor/ HP
- Churchs have high armor/ HP and arnt this kind of vet sponges for a jp like you think...because of high armor and relative cheap price..so no..it doestn vet fast at a church
- comet have high armor
> all this targets have a good chance to bounces jp shots often
2.
jackson has 60 range