Lots of amazing recommendations, here some from my side:
Centrifugal Funk may be the most guitar album for electric guitarists I know, I own a copy of the original CD, some years ago they made a reissue, it was just crazy fusion shred by Gambale, Garsed, Lane, actually in the cover you can read:
"Warning: Contains guitar performances of unparalleled speed, taste and virtuosity. Not for the faint of heart!"
I love too Quid Pro Quo and Exempt by Garsed / Helmerich, amazing beautiful music. Not strictly a guitar album but, yeah, it is, Brett Garsed delivered another masterpiece on Bobby Rock Out of Body (yes, I am a Garsed fanboy).
On a more modern side, Intervals - In Time was quite ground breaking for me, more than the subsequent albums by a lot.
Also I just love Flamenco guitar, so I could not forget masterpieces like Siroco from Paco de Lucía, well in general anything he released.