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The Panasonic Leica 42.5mm f/1.2 has some serious competition, in terms of price and image quality. They are roughly the same weight, PanLeica is 425g vs Fujifilm XF 56mm 405g. The heaviest guy is the Voigtlander Nokton 42.5mm f/0.95 at 571g.
Price would be US$1600 (PL) vs $1000 (F) vs $1000 (V). That's a huge difference in terms of pricing.