And neither did the Canadian Leopard 2A4+
Actually the Leopard 2A4+ never existed, it was a concept (original planning) to fit a standard Leopard 2A4 with the same gun that equips the Leopard 2A6 in order to train crews for the Leopard 2A6M CAN since the original plan consisted in having 40 combat ready Leopard 2A6M CAN.
But now what Canada decided to drop the "Leopard 2A4+" concept because it was decided that the combat ready force would be composed by 20 Leopard 2A6M CAN and 20 Leopard 2A4M CAN (a total of 40 combat ready tanks).
As for the remaing Leopard 2A4s (the "training force") they will either be upgraded to Leopard 2A4M CAN or will be simply be kept as standard Leopard 2A4. The later possibility is more likelly, even because if there's ever a need to send "training" Leopard 2A4 tanks into combat those same tanks could be easily and quickly upgraded to the Leopard 2A4M CAN configuration.
Actually the reason why I asked for this (the replacement of Canadian Leopard 2A4+ for the Leopard 2A4M CAN) was because like I previously said, the Leopard 2A4+ never existed!