I'm a photography hobbyist. I know that a great lens infront of a sensor makes a difference in image quality. Sometimes though image qualities are subjective and not necessarily categorized as better or worse, but rather different.
Are Theia lenses noticeable improvements in IQ over the unknown brand lens?
Theia lenses aren't cheap and not so easy to obtain. B&H does sell them.
Talking about using them on 2MP, 5MP and 8MP Sony sensors like IMX290, IMX178, IMX274.