Uthman create a standard of quran. Before that there are many versions of Quran. Are there any of those other versions that survive now?
The lower text of the Sana'a manuscript is, as far as I know, the only existing example of pre-Uthmanic Qur'an available today. Uthman's text was standardized very early in Islamic history; every live copy, and pretty much every historical manuscript, we have to date is based on the Uthmanic tradition.