Huh interesting. I had no idea. The more you know I guess 🤷

Caught this discussion late but honestly, like someone mentioned, the a7C II is the smarter buy if you want to save that $300. But I would suggest being careful about how it feels in your hand. I did a week in the mountains with a compact setup once and realized too late that my favorite Sony FE 24-105mm f/4 G OSS lens made the whole thing super front-heavy. It was kinda annoying to carry all day without a proper grip. Basically the thread so far is saying a7C II for size and a7 IV for the pro features. One thing to watch out for is the EVF... it is significantly smaller on the compact body. If you use the viewfinder a lot, it might feel like looking through a straw compared to the Sony a7 IV. Quick tip: Grab the Sony GP-X2 Extension Grip if you have larger hands. It adds almost no weight but makes the ergonomics way better for long days of shooting.

1. Sony a7C II:

   • Compact and Lightweight: The a7C II is incredibly portable, making it an excellent companion for travel. Its small form factor won’t weigh you down during long journeys.
   • Cost-Effective: Opting for the a7C II will save you around $300 compared to the a7 IV.
   • Image Quality: With its 33.0 MP resolution, the a7C II delivers impressive image quality.
   • In-Body Image Stabilization (IBIS): Shake-free shots are essential for travel, and the a7C II offers this feature.
   • Fast Burst Mode: Capture action with a continuous shooting rate of 10 FPS.
   • Video Capabilities: Shoot 4K video at 60 FPS with 10-bit depth.

2. Sony a7 IV:

   • Autofocus Excellence: The a7 IV boasts a more advanced 759-point phase detect AF system, ensuring sharp focus even in challenging conditions.
   • Higher Resolution: Although both cameras share a similar resolution, the a7 IV’s sensor provides more flexibility for cropping and editing.
   • Low-Light Performance: The a7 IV shines in dim lighting, thanks to its impressive low-light autofocus sensitivity.
   • Dual Card Slots: If you’re concerned about data security during travel, the a7 IV’s two card slots offer peace of mind.
   • Larger Viewfinder: The a7 IV provides a more substantial viewfinder, which some photographers prefer.
   • Weather Sealing: Built to withstand the elements, the a7 IV is weather-sealed for durability.

Considerations:

• Ease of Use: The a7C II’s compactness may appeal to those who prioritize convenience. However, if you’re comfortable with a slightly larger body, the a7 IV’s additional features might be worth it.
• Travel Priorities: Think about your shooting style. If you prioritize portability and want to save money, the a7C II is a solid choice. If image quality and advanced features matter most, lean toward the a7 IV.
• Personal Preference: Visit a camera store if possible and handle both models. See which one feels more intuitive and comfortable in your hands.

Ultimately, it boils down to your specific needs and preferences. Both cameras are excellent choices, so consider your priorities and go with the one that aligns best with your travel photography goals! 

I prefer a7C II, more compact and newer.