45mm TS-E... Meh?
Too bad you don't like it -- the 45 TSE is one of my favorite lenses. I haven't needed 4x5 for 10 years, and I certainly don't miss it. But I will agree that no 35mm-style DSLR matches 4x5 for IQ, at least without composite or multi-shot panorama.
Details are outstanding, and the small amount of CA can easily be corrected in LR.