Could this be an improved 40mm?

A couple of test so far of the Pentax M 40mm 2.8 has shown much better image quality than I remember.  Maybe not using it for more than three years and I forget the image quality... I did a head to head test against my DA 16-45 and set to 40mm on the K20D.  I seems the sharpness goes in favor to the pancake.  I might guess that the lpmm is around 70 at center and 65 at the corners although that is hard to tell with a digital.  I don't have absolute specs to the proper thickness of the cement or if my alignment is correct, but I recall it scoring around cent/corn at about 62/52 high to 52/44 low in lpmm.  The color anomalies are also different now as well.  It was a clear shift from blue and soft red to is more a dull red, a faint chromatic aberration at the corners now and that is less noticeable overall.  So it looks like something wrong was right.  The only concern is if the cement has not fully dried, will this stay this good and improve over time or will it get crappy.