I own an IF Crown Jewel. It's not all 853 steel, they often mix alloys.
Mine is custom made to fit not only my body, but how I ride & what I want the bike to do. Part of the IF fitting process is a 2 page Q&A session about your current ride, what you like & dislike about it, what ride qualities you want in the new bike, what kind of rides you will take it on.
I'm tough to fit, with long legs, a short torso & 6'3". I wanted a bike for fast recreational rides and regular centuries. I wanted confident handling & did not need 'take your hands off the bars and look at the scenery stability'. And that's just what I got: first bike I have ever ridden a century in with NO back pain, corners like a cat on carpet & she reads my mind on handling. Because she's exactly what I wanted. But perhaps not what you wanted.
But I do miss the lugs. Perhaps a faux lug paint job next time?