as oldies I mean my film gear (very modest, I know): FAJ18-35, FA24-90 and FAJ75-300 - all below average anyway... until now: no go with K100D and with K10D- but some design differences between Sony CCD versus Samsung CMOS was so interesting that I today made a stroll with elderly exclusive :-)
And I was really amazed (not only with cheap glass as it is as it is...) with K20D once again... PF and most of CA gone- and yes I know, why...
and another fun for me: even with FAJ75-300 awful focusing gear K20D did a superb AF-C job (neither K100D nor *ist could not cope) with ducks on the pond- and of course ISO2000 was enough for 5x7 prints- YYYYeeeeSSS!!!
Best and happy shooting, JR