It's Sukkos morning and you are stuck with a non-mehudar esrog, but if you just wait until after davening, you will be able to obtain a mehudar esrog for the mitzvah of netilas lulav. Is it better to fulfill the mitzvah of lulav as soon as possible in a zerizus manner even with a non-mehudar esrog, or is it better to wait to obtain the nicer esrog and fulfill the mitzvah in a mehudar manner at the cost of sacrificing zerizus?
The Gilyon Mahrasha in Yoma quotes the following proof from the Shvus Ya'akov: If the members of a beis av of kohanim are tamei, the gemara (Yoma 6) quotes a machlokes whether tumah hutra b'tzibur and those kohanim can still offer korbanos tzibur, or tumah dechuya b'tzibur and other kohanim should be called to offer the korban in their place. Even though there will be a delay in calling in those substitute kohanim, the gemara assumes that a delayed korban offered b'taharah is preferable to offering the korban immediatly b'tumah. QED, says the Shvus Ya'akov, it is better to delay a mitzvah a fulfill it in a mehudar manner than to fulfill it immediatly b'zerizus in a less than mehudar fashion.
I am not sure I see the comparison between the two cases. If tumah dechuya b'tzibur, offering the korban b'tumah is not just a less than ideal kiyum mitzvah - it is not a mitzvah at all! To take a different example, if one assumes Shabbos is dechuya with respect to a dangerously ill choleh (and not hutra), accomplishing the task of pikuach nefesh by using fewer melachos is not just an ideal, but it is the only permissabel option - to perform more melacha than necessary would be chilul Shabbos. The same is not true with respect to the case of the esrog, where one fulfills the mitzvah of esrog whether done b'hidur or not. Hidur may be an ideal, but is it worth the delay where there is a kiyum mitzvah anyway?