I'm seeing the exact same regression. My custom PDFAnnotation subclass overrides draw(with:in:) to draw a hand-drawn vector stroke (UIBezierPath) plus a CGImage icon via context.draw(_:in:). Same code renders perfectly sharp on iOS 26 and earlier, but on iOS 27 it's visibly blurry/pixelated in PDFView — even at default zoom, no pinch needed.