For who in the heaven ... - literally, In the cloud; that is, in the sky. The idea is that none in the regions above - the upper world - can be compared with God. There is no other god - there is no one among the angels, great and glorious as they are, that can be likened to him.
Who among the sons of the mighty ... - The angels - regarded as mighty. The “sons of the mighty” on earth are spoken of as mighty men - as men of power - as men of exalted rank. So here, the idea is, that none of the angels, though of exalted rank (“principalities,” or “powers,” compare Romans 8:38; Ephesians 1:21), could be put in comparison with God. See the notes at Isaiah 40:25.