Liszt's transcription of Wagner's Lohengrin themes demonstrates his unique ability to translate symphonic drama into solo piano literature. The piece is highly regarded for its beautiful, transcendent melodic passages.
Pay close attention to the pedaling to ensure the resonance of the arpeggiated figures does not blur the main melody.
Comparable difficulty and character — good candidates for what to learn next.
Aus Lohengrin, by Wagner (S.446) is rated Henle level 8 of 9 — concert repertoire, roughly diploma level. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 8 — meaning you can already play level 7–8 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Aus Lohengrin, by Wagner (S.446) lasts about 6 minutes.
Aus Lohengrin, by Wagner (S.446) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Aus Lohengrin by Franz Liszt, Aus Lohengrin, Wagner by Franz Liszt, Un sospiro by Franz Liszt — see the full similar-pieces list on this page.