Comparisons of works like this and Lachner 6 with Beethoven's and Schubert's 9th (especially their length 
) seem to come to my mind immediately but so does the fact that the composers probably only knew those works from knowing their composers - Schubert's 9th wasn't premiered for some while after either symphony, Beethoven's 9th I think either (in both cases posthumously? )
Beethoven's 9th premiered posthumously? Hardly, dear friend. Know you not the famous tale of Beethoven, quite deaf by now, thinking he was conducting the premiere of the 9th in 1824, while the actual duties fell to the concertmaster of the orchestra, who turned the still conducting composer around after the end to face the wildly cheering crowd?
Schubert's Great C Major, on the other hand, did not see the concert hall until 1839, fully 11 years after Franz Peter's demise.
