Looking for a solid electric guitar kontakt library like "Real Eight", but for kontakt. Thank you!

 

The best for me is Impact Soundworks Shreddage II. Good balance between resource usage, articulations and sound. 7 strings.
Another very good one is Orange Tree Samples Dracus. Lots of articulations but much more heavy on the CPU and memory. 8 strings.

There're more but you can't go wrong with these two.