I have both. The Indra is incredibly detailed, transparent, neutral but full-bodied, a bit warmer than Valhallas, which I also have.
The Sky's are excellent cable but I would say a notch below the Indra's in the food chain, very well-balanced, good body, not as fast or transparent as Indras, better for a component that is a bit "hot." Very "liveable" cable; does nothing wrong.
Just my op.
Neal