My 2001 DSC-S85, 13 years old, looks like yours, it works great, always has
http://www.dpreview.com/products/sony/compacts/sony_dscs85
big 1/1.8" 4mp sensor, . Bright f2.0 to 2.5 lens at 34mm to 102mm, uncompressed TIFF option
Highlights, some of which are missing on the new RX series.
Threads on body, with extension collar, to get past end of lens when extended. This gave a professional option for filters, conversion lenses, all with the weight transferred to the camera body. Solid attachment, dust proof and moisture resistant.
Huge Battery (R1, 4 years later used the same one)
Shoe/Jack for Big External Flash (R1 used the same one)
Combo of Optional Viewfinder and Screen. I would take a smaller screen to get an EVF on RX series.
Ability to turn screen off, use in the dark in a public place without flashlight effect.
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Elliott