Kv-1 has 12.5% more frontal/side armor than Churchill.
Churchill has 225% rear/side armor more than PzIV.
And according to you its more or less the same. Ok I guess you "the same" has different meaning for you and rest of the world.
It is more or less the same because in 90% of cases you fight vs a tank´s frontal armor. Churchill is not UP, it´s balanced. It still doesn´t have impressive armor but that´s ok because it has decent firepower and HP.