SLRs that are RF like seems like a bit of a stretch is my first thought. The whole RF thing is about the finder and how you view through basically a plain ‘window’, set (bright-line or outlined) frames, and the mechanics (not eye judgment) of the RF for focus. The advantages, and disadvantages between an RF window/patch and the SLR finder, and seeing through the lens are very different. But there are a couple that may fit in this RF-SLR from my personal experience.
One is the ALPA 9d. With its size and curved M-like shape, it was what I thought of as an M-SLR, finder view differences aside.
The other is the original Leicaflex. It's basically an M3 in an SLR body. The shutter is an M-series shutter in a different style, shape/size body, very well made ‘M3-like.’ Dense and heavy like an M-series, it oozes quality, and the curved back/flat front give it a unique feel in the hand. It's not like any other SLR is this way. Although the original Leicaflex took a lot of criticism for its ‘limited’ focus finder, it does have an almost RF advantage, as it is very very bright, maybe a bit brighter than even an M3 window (even with a so-so fast f2 lens), and if you think that the M3 just had a small patch for focus, the round central micro-prism focus patch of the Leicaflex isn’t so bad. Also, if you think of the M-series size with an added MR meter on top, the Leicaflex with its built-in MR meter doesn’t seem that big ;-) I really think Leica was not trying too hard to make a ‘real’ SLR uniquely different from their M-series, but trying to make something more like a combination of the M-series in an SLR style body, kind of a half-and-half (not all-in, following the trend, and still relying on what they did best [M-series] at the time) if that makes sense.
As a bonus, [at least the earlier] Leicaflex lenses are built with an M-series quality and an optical style design in mind. They are still very good.