I would believe the IS 3, it had an equivlent gun, it was faster and had a moving turret.
look at these mad french tanks in the works! they could of KILLED germany in 42.
http://france1940.free.fr/armee/otdb1.html
the FCM F1 was a 140 ton tank!
"Twelve of these 140 tonnes behemoths were ordered on 27 April 1940 to replace the aging FCM 2Cs. This tank, designed to lead assaults on the Siegfried Line in 1941, was to be armed with a high-velocity 90mm gun (mv 710 m/s, penetration 100mm at 1000 m) in the rear turret and a 75mm SA 35 in the front turret (the mock up above shows a 47mm gun mock up instead) with a 25mm AT gun on each side of the hull ! The design wasn’t finalised however and armament variants included a 105mm gun in the forward turret of in the front hull. Its front armour was to be 120mm with 100mm side armour and its two 550 hp engines would hopefully allow it to race along at a mighty 24 km/h… "
Renault G1R:
"The 1936 requirement for a D2 replacement in the “battle tank” role called for a 20 tonnes tank, capable of 40 km/h, with the armour of a B1 bis, a 47mm SA 35 turret gun and a hull-mounted 75mm gun. However, Renault’s design evolved into a 35 tonne tank with a turret mounted “high power” APX 75mm gun… which was rejected on 14 May 1940 because it was too far from any official requirement ! "
you gotta see these!