I’ve been having a blast playing the Finnish PS.221 (Panzer IV J), and I’ve noticed that it pairs really well with the KV-1 (1942) in the same lineup. As long as you don’t rush straight into close-quarters brawls and instead stick with your team or find a solid sniping position, the tank is incredibly enjoyable to play.

The long 75mm gun has great penetration and solid damage. I’ve had good success dealing with the upper front plates of Tigers and the turrets of Panthers at around 500–800 meters. Shermans are usually easy to handle by simply aiming for the hull, and even Jumbos can be taken out reliably by targeting the MG port.
That got me thinking, wouldn’t it make more sense, BR and lineup-wise, to move the Panzer IV J (and maybe even the Panzer IV H) up to 4.0/4.3? They don’t perform nearly as well against 6.0 vehicles, so keeping them at 5.0 can feel a bit unfair in full uptiers.
My playstyle for the PS.221(Panzer IV J) is just like how you would play a Eventual Ps. 531(Stug III) Hang back with your team and make slow advances or simply stay along the borders of the map and pick off anybody denying access for your team, Be a Counter-Sniper if you will.