For the first few years of operation, how did Hubble's data quality compare to many well-maintained ground-based observatories on a clear night?

Answer

Inferior

The spherical aberration problem meant that for the first few years, scientists were working with data that was far inferior to what many well-maintained ground-based observatories could achieve on a clear night.

For the first few years of operation, how did Hubble's data quality compare to many well-maintained ground-based observatories on a clear night?
Spaceastronomytelescopesciencespace explorationHubble Space Telescope