just saw this thread and wanted to chime in because i have been a sony guy for over a decade now. the main thing people miss with sonys is the vertica...
Respectfully, I'd consider another option. Ngl, the lenses you mentioned are solid, but I think the Viltrox AF 13mm f/1.4 E is a way better value for ...
Coming back to this... I totally get why you're hesitant about the Sigma's price. Honestly, for your situation, I would suggest looking at the Viltrox...
You can find new deals at Amazon and B&H Photo Video. While used deals at KEH and MPB.