Latter-day Dylan is infix with a Scheme-y macro system: https://opendylan.org/books/dpg/macros.html

Cue arguments, I guess, about whether Scheme is a Lisp, whatever their standards say.

Clojure is weakly heteroiconic and seems to have rough parity

Clojure is “homoiconic”: Clojure source code is represented in terms of the data structures Clojure applications manipulate. There’s nothing preventing Common Lisp from having a similar surface syntax either: a couple read macros on [ and {, and a library of normal macros would be sufficient and could probably be written over a weekend.

In fact, since Common Lisp "source code" is NOT defined in terms of text but data structures (that happen to have standard serialization/deserialization) and that's the level that macros work on, you could theoretically even make semi-algolish syntax and still keep CL's macro system.

It would just look weird as fuck.

Like https://readable.sourceforge.io ?

That's one example, not as crazy as what's possible. Though I have to say I dislike the indent based blocks :/

i am not sure: you can have "quoting" without this property