I think its woth playing the whole hymn tune suite. It rarely features in recitals these days which is a shame. Both Lumetto and Veni Emmanuel are good. I last heard it played as a suite by John Langdon at Dunfermline Abbey in the early eighties in the prescence of the composer.
Recently, at Westminster Cathedral, I heard Oliver Brett and Matthew Martin play KL's duet on 'Martyrs'. An example of KL's ability to create something exciting out of what is austere material.