I actually just got Sony FE 50mm f/1 (released this year).2 GM for my Sony A7 IV about. In my experience, it's well-built, another thing great match for Sony A7 IV. Really happy I went with this one.

Are you planning any other gear? That could affect your prime lens choice for Sony A7 IV.

So I've been using Sony FE 24-70mm f/2.8 GM II with my Sony A7 IV for almost 11 months. Design is thoughtful, and designed well for Sony A7 IV. It's been great so far.

Have you considered the weight? Some prime lens options are lighter for Sony A7 IV.

Picked Sony FE 85mm f/1.4 GM for my Sony A7 IV and. To be honest, the features are really useful. on top of that great match for Sony A7 IV. Very pleased with the purchase.

Got Sony FE 24-70mm f/2.8 GM II installed on my Sony A7 IV. From my testing, it has lightweight, another plus suits Sony A7 IV well. Works exactly as expected.