The KT is quite frankly the best Tier 8 heavy imo just edging out the T32 because it's not always able to hide it's paper hull.
I haven't started to enjoy my E-75 yet. I'm finding it to be a bit paper thin right now, even though I know it's a bouncer. I'm lacking the turret and the 12.9 so I'm sure it will all change then.
Really, I just cannot be hassled with WoT at the mo. Did play Company Battles with TS support with my clan. 9 battles, 7 wins, 2 losses.
People keep saying that about the KT, but I found it never bounced anything due to the tanks it faces. It was just weak. The speed didn't allow it to outmanuever anything and that gun is just pitiful. I really hated the tank and enjoy driving the IS-3 more than I do the KT.
I've found the E-75 to be much more survivable with it's armor. In a game I killed 6 in I went head to head with an IS-4, bounced all his rounds and killed him and the T-54 with him without taking any damage. Angling the hull and protecting the side of the tank makes it really hard to hurt.
I have the 12.8cm though so it makes a big difference, people fear that gun like on the Ferdinand and really changes how they approach an E-75 I think once they get a taste of it. It makes their willingness to line up a weakspot shot on an E-75 that much less and rushes shots, letting even more of those rounds bounce against that thick frontal armor.
But to each their own, I for instance love the IS-3 despite it's weak armor due to the gun and speed. Not too many would take it over a KT.