Just saw your post and wanted to weigh in. For street shooting in Chicago without that bulky adapter, you might want to consider these two native options. I would suggest being cautious with your budget as prices fluctuate.

• Canon RF 35mm f/1.8 IS Macro STM: This lens is quite versatile for the R6 II. Make sure to note that while it has great image stabilization, the STM motor isnt completely silent. It usually stays well under your 600 dollar limit.
• Canon RF 50mm f/1.8 STM: This is the most cost-effective path available. It is tiny and light, but be careful with the build quality since it lacks weather sealing. I think the 35mm is a safer bet for street work, tho the 50mm is basically invisible on the camera. Just watch out for the autofocus speed on the 50mm... it can hunt sometimes.

Ngl Id skip the 35mm and get the Canon RF 28mm f/2.8 STM pancake. Im super satisfied with mine and it makes that R6 II feel like a real compact.

> The adapter on my R6 II makes my old 35mm feel way too bulky for street shooting in Chicago. I totally get that frustration. The balance on the R6 II gets wonky when you add that extra inch of metal and glass... I spent way too much time digging into MTF charts and motor specs before I finally decided to ditch my adapted glass for something native. I ended up going with a tiny native prime because the weight-to-performance ratio was honestly just too good to ignore. It weighs basically nothing compared to my old setup. When I was out walking around the city recently, I was super satisfied with how the motor kept up with fast-moving subjects. It really proved that you dont have to spend a fortune to get snappy results. My current setup feels way more nimble and the weight savings are a lifesaver for long days tho. If you look at the technical specs for the smaller native options, the reduction in total length makes the camera way less intimidating for street stuff. Lemme know if you want the specific specs I looked at.

I shifted away from using adapted glass about a year ago after a frustrating experience where the adapter started losing connection with the body. It made me realize that even if the old optics are great, having that extra mechanical failure point isnt ideal for a daily driver. The native prime I eventually settled on has been much more consistent for me. I found that the autofocus communication is significantly more reliable when there isnt a bridge between the lens and the mount. My current setup is way more balanced and I havent dealt with any of the weird freezing issues I had before. For me, the peace of mind knowing the gear will work every time I pull it out of the bag was the biggest factor. Going native definitely fixed the wonky weight distribution too.