The PZKFW IV (F-J models) were something of desperate measure by the Germans to come up with SOME sort of tank that at least had a chance against. the T-34 & KV-1 Soviet tanks. Yes, it did have a pretty good gun, (L-40, and later L-45 in length), but its armor was not much better than before, so additional armor plates were added, along with ‘Schurzen’ armore skirts, but all of this just added a lot more weight to the vehicle and most particularly, to its already over-loaded suspension system. It ‘worked,’ but it did not provide any measure of superiority over the T-34, and in particular, the T-34’s superb mobility over snow and mud. Because the Germans could not produce enough tanks to come close to Soviet production quantities, it became critical that the Germans create a thoroughly superior tank. The Panther tank was the German ‘answer,’ but it had a lot of initial teething problems, particularly with its transmission and a tendency to overheat (to the point of catching fire), though these had been iron-outfor the later models. But it remained a complicated tank to build and maintain, and when the Soviets replaced the 76.2mm gun on the T-34 with an 85mm gun, the ‘antitank’ capability remained mostly on a par with one another. The German ‘tiger’ tank was another attempt at a ‘solution,’ but was never really considered to be any sort of ‘general issue’ tank, but was restricted by their low numbers to very specific ‘breakthrough’ units that spent much of the war acting as a ‘fire brigade’ to stop Soviet breathroughs. Again, the tiger had ITS problems as well, and really couldn’t be driven for more than 60–80 miles before being forced to stop for major maintenance. For this reason, the tigers were generally transported from one part of the front to another by train, which of course is a pretty ludicrous scenario for any sort of tank on a battlefield the size of the Russian front.
One effort that the Germans had more success with was the mass-production of ‘turretless tanks,’ i.e. the ‘Sturmgeschutzen’ or ‘Jagdpanzers,’ which had their gun mounted in a hull that was generally better-armored than the corresponding tank version, and this reduced the overall height of the vehicle considerably and increased survivability. However, while these were often thrown into the assault by the Germans, they really were best-suited for ‘ambush’ scenarios, where their lack of a traversible turret did not interfere with their combat effectiveness.
Source : https://www.quora.com/If-Panzer-4-can-penetrate-T-34-correct-me-if-Im-wrong-why-need-for-better-tanks-like-Tiger-and-PanthersThank You for Visiting My Website