Best budget prime lens for Sony a7CII?

I've been using the a7C II for a few months and I'm quite happy with the results from native full-frame glass. For your budget, I recommend the Tamron 35mm f/2.8 Di III OSD M1:2. It is exceptionally sharp and usually retails for around $200-$250. It works well for street photography due to its compact size, though the autofocus motor is a bit slower than Sony native options. If you need something specifically for portraits, the Viltrox AF 85mm f/1.8 II FE is an excellent choice at approximately $370. It delivers professional-grade bokeh and sharpness. There haven't been any complaints regarding the build quality on my end, but do keep compatibility in mind. Third-party lenses sometimes require firmware updates via a USB dock to maintain optimal autofocus performance with Sony's newer AI-tracking systems. Sticking with full-frame glass is definitely the way to go since it ensures you aren't wasting the sensor potential of the a7C II.

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Heard good things about the Sigma 30mm f/1.4. I had issues, unfortunately. Maybe try it, but test it thoroughly first!

Consider Sigma's 30mm f/1.4 DC DN! Technically designed for APS-C, but some a7CII users adapt it successfully in crop mode, yielding amazing sharpness for street. Crucially, test compatibility first! Vignetting may occur. Fantastic value; avoid exceeding the lens's resolving power. If unsure, consult a Sony lens expert for optimal full-frame performance!

Used Sigma 30mm f/2.8. Great value, sharp enough, often under $200. It works.

Before sharpness, consider build quality. A drop can ruin your shoot. The used market has robust Sony FE 50mm f/1.8 lenses. Check for impact damage first!

Samyang 35mm f/1.8. Street/portraits, good value. Research user reviews – lens quality varies.

Forget chasing ultimate sharpness for now. I've tried many budget primes. Consider a used Sony 50mm f/1.8. They're cheap, reliable, and great for portraits. More importantly, you'll learn what you *really* need before dropping serious cash on something fancier. Over the years, I've found that's the best 'investment' in the long run.

Before buying, consider adapting vintage lenses! Old Pentax glass (under $100) can be surprisingly sharp with an adapter. It's DIY fun and saves serious cash. No complaints so far!