well i decided to compstomp with allunit mod and here is what i found out..
1) 2 command panthers buff each other and they double buff normal panther as it gets 2 command panther icon and i also tested rate of fire of normal panther with 2 vet 5 command panthers.
2) vet 5 jagtiger reload rate is about 4 secs with 1 vet 5 command panther next to it. the weapon range does increase but its not significant ( +5 range i guess)m next to vet 5 command panther.
3) 2 command panthers are better than 2 king tigers.