After our engineers compared the specifications with similar products sold in Japan, we determined that ours is highly competitive.
Literal
Our-company's engineers [subject-が] Japan-domestic [in-で] sold similar products [with-と] specifications [object-を] compared result, very competitive-power exists [quotative-と] judged humbly-did.
An extremely dense business sentence. 非常に競合力がある means 'is highly competitive.' 判断いたしました uses the humble いたす. 比較した結果 is 'as a result of comparing.' The whole thing reads like a business proposal — formal, detailed, and humble toward the recipient.