so far, I just have one, I bought an " experienced " SMC Pentax-DA 21mm F3.2 Limited
I grabbed the " experienced " 21mm after reading the opinions ( and warnings ) contained in this thread
the limiteds do they live up to the reputation and why - Page 10 - PentaxForums.com
[ I did have had the SMC Pentax-DA 40mm F2.8 XS ( the best lens in its class ) first but admittedly its construction doesn't allow it to be claimed to be a true " limited " despite sharing the 40mm limited small size and optics ( ? ) ]
but who can foretell the future:
I am renting a SMC Pentax-FA 31mm F1.8 AL Limited for my Yellowstone trip beginning Monday
I like the 21 but really haven't had much opportunity to use it yet but the landscapes in Yellowstone are calling to me
the 31 limited will allow me to leave 2 primes at home - Kino Precision Japan Kiron 28mm F2 MC P/KA and DA 50mm F 1.8
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so who knows what might be in my future ( anniversary is in September after all )