Platform: Steam on Win 10
Build: 1.0-947
My playthrough focused on gathering data for this. I upgraded only the fruit seedling crops through the lab. I did NOT select the "quality crop" option from mastery skills. My farming level is 10.
My harvests showed that upgrades improved the quality overall. However, while the gold upgrade started producing gold-quality fruit, the osmium upgrade did not produce any osmium-quality fruit despite a larger sample size.

