Well I got in last night. French passport leaving London. Wizz asked for my PCR at check-in (the agent spoke with her manager for maybe 3 minutes first, that was the only mildly stressful part), and when I got to the Hungarian border in BUD I got asked for either a fresh PCR test or proof of vaccination. I had my PCR on me so I didn't try to show the EU DCC QR code, and that was it.