I'm not a Soviet fanboy, but I could sense what seemed to be abnormal stats for the Soviets' tanks in CW, so I created two simple scenarios to do a simple test of the T-64 and Tiger tanks' sight-seeing abilities.
The scenarios isn't symmetrical, but I'm sure that says something enough. I put these machine gunners on suppressive fire and watched to see how often they would be taken out by enemy tanks.
Within 15 seconds a T64B spotted a machine gunner in a building and took him out, but they had nothing to do for the next 5 minutes.
It was not until about 8 minutes later that they spotted the machine gunner who was firing in front of them without any cover.
Now let's see what WWII tanks do:
They spotted the machine gunners without cover within half a minute.
And within 5 minutes they also spotted a machine gunner in a building.
The performance of Soviet tanks in CW is absolutely ridiculous. Please fix them, thanks!