mention any one comparison of it with other tanks?
The Leopard 2A4 and Leopard 2E sport a much more powerful gun than the AMX-30 and M60 tanks.
Leopard 2E
Previously, the Spanish army was equipped with M47 and M48 Patton tanks, which were upgraded to near M60 equivalency during the late 1970s and during the 1980s. Both the Leopard 2A4 and Leopard 2E sport a much more powerful gun than the AMX-30 and M60 tanks. The Leopard 2's engine provides greater power than the 
what is referred as leopard 2e? The Leopardo 2E or Leopard 2A6E is a variant of the German Leopard 2 main battle tank, tailored to the requirements of the Spanish army,.
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Leopard 2E [SEP] Comparison with other tanks in Spanish service
The Spanish army replaced its M60 Patton tanks and AMX-30s with the Leopard 2 between 1995 and 2008, a considerable improvement in capability. Previously, the Spanish army was equipped with M47 and M48 Patton tanks, which were upgraded to near M60 equivalency during the late 1970s and during the 1980s. Both the Leopard 2A4 and Leopard 2E sport a much more powerful gun than the AMX-30 and M60 tanks. The Leopard 2's engine provides greater power than the M60A3's and the AMX-30EM2's engines. On the other hand, the Leopard 2 carries fewer, but larger, rounds than the M60A3.