SMT ACFT ON IFR FLT PLAN AND LNDG IN INST CONDITIONS. RPTR PLT FAULTS ANOTHER PLT FOR LNDG IMC WHEN NOT ON AN IFR FLT PLAN.

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UPON ARR IN THE VICINITY OF IKK THE AWOS WAS RPTING 600 FT OVCST; VISIBILITY 4 MI; TEMP 58 DEGS; DEWPOINT 51 DEGS; WIND 050 DEGS AT 11 KTS GUSTING TO 20 KTS; ALTIMETER 29.85. ZAU CLRED ME FOR THE ILS APCH TO RWY 4 AND CLRED ME TO UNICOM FREQ. JUST PRIOR TO THE FREQ CHANGE; CTR ADVISED ME OF EBOUND TFC 10 MI W OF THE ARPT. I MADE A TFC CALL AT THE OM AND AGAIN AT APPROX 3 MI ON FINAL. AFTER THE SECOND CALL; X ADVISED ME THAT HE; TOO; WAS ON THE L BASE FOR RWY 4. I WAS STILL IMC AND MY TCASII HAD TFC 300 FT BELOW ME AND 1.1 MI. I ADVISED HIM OF THE CEILING AND VISIBILITY SIT AND HE SAID; 'I KNOW. THAT'S WHY I AM LNDG.' HE ADVISED ME THAT HE WOULD CIRCLE ON THE BASE LEG AND LET ME LAND AHEAD OF HIM. I NEVER SAW THE OTHER ACFT UNTIL AFTER I HAD LANDED AND CLRED THE RWY AND HE WAS ON SHORT FINAL. AFTER LNDG I RECHKED THE AWOS AND IT WAS STILL RPTING THE SAME 600 FT OVCST AND 4 MI. AT THE TIME OF THE EVENT; I THOUGHT OF A NUMBER OF CORRECTIVE ACTIONS; ANY ONE OF WHICH WOULD MOST LIKELY HAVE RESULTED IN MY ARREST. PERHAPS AN FAA ENFORCEMENT ACTION WOULD ENCOURAGE THE PLT OF X TO PAY CLOSER ATTN TO THE MEANING OF IFR; VFR; IMC; AND VMC BEFORE HE KILLS HIMSELF AND SOMEONE ELSE.