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The Leica 15mm f1.7 is not quite a pancake, but really small, made of metal, has an aperture ring and rapid autofocus.
Absolutely fabulous lens.
Not weather sealed though, and slightly unusual 30mm focal length.The 42.5mm f1.2 nocticron looks amazing too, and has aperture ring, but not pancake size.
The 14mm f2.5 is a great, rapid focusing pancake but not weather sealed and tiny manual focus ring.
The Pana-Leica 25mm f1.4 v2 is a great lens, and now has weather sealing. Also compared to full frame and crop sensor, still very small.
Dont think any of the Olympus lenses have aperture rings, though some have focus clutches.
Do any of the pancake lenses have manual controls? They have focus by wire rings, at least the 14 and 20 mm. That's fine with me, the problem with the 20/1.7 is that it's incredibly slow to focus even on a PDAF body, and it's not weather sealed.