hsandler
Subscriber
I have Autocord and Diacord TLRs with 4-element lenses, and I have had a succession of folders. I'd say the Super Ikonta IV was as sharp, but that camera is at the top end of folders, costing more than most non-Rollei TLRs, and I happened to get a pristine one.
Parc Olympique, Montreal by Howard Sandler, on Flickr
I have also had a succession of inexpensive folders, such as the Franka Rolfix, with 3-element f4.5 or slower front-cell focus lenses and no rangefinder. My feeling is that if you're going to get a folder, go for 6x9 to get the largest advantage of its compactness compared to the alternatives. I find the inexpensive folders fun and sharp below f8, but not nearly as versatile as a TLR in lower light. They generally have repairable issues, either pinholes, sticky or dried grease focus, non-PC shutter terminals etc, but not the way to go if you are not willing to do some repairs yourself.
National Gallery of Canada by Howard Sandler, on Flickr
Perhaps consider buying one of these inexpensive less well-known folders such as Franka, Balda or Welta and trying for awhile before jumping in to an expensive top-tier one.

I have also had a succession of inexpensive folders, such as the Franka Rolfix, with 3-element f4.5 or slower front-cell focus lenses and no rangefinder. My feeling is that if you're going to get a folder, go for 6x9 to get the largest advantage of its compactness compared to the alternatives. I find the inexpensive folders fun and sharp below f8, but not nearly as versatile as a TLR in lower light. They generally have repairable issues, either pinholes, sticky or dried grease focus, non-PC shutter terminals etc, but not the way to go if you are not willing to do some repairs yourself.

Perhaps consider buying one of these inexpensive less well-known folders such as Franka, Balda or Welta and trying for awhile before jumping in to an expensive top-tier one.