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Seeing as he was originally able to fight on even terms with Thor, and going by the below wordage/actual feats since then:

http://2.bp.blogspot.com/-8UJfjxb-PBw/Vnp5YniX23I/AAAAAAAAXvw/xuNXvo-Qf2U/s1600-Ic42/RCO021.jpg

They are basically twins power wise.

Thor

K