For what it's worth, and I omitted to mention in my initial response, Sony's motionflow on my OLED is the best of both worlds, at it's lowest setting it introduces such a subtle smoothing process that soap opera effect is not evident.
That said, it's very subjective. Judder to me may look smooth to you, and a small amount of smoothing may look artificial to you, but perfectly reasonable to me. I think it's this subjectiveness that makes interpolation such a hot topic. People on these forums have had some seriously heated debates about it.
There's no substitute for taking content to a local stockist and seeing for yourself with a USB loaded with sample media.
Sony has class leading motion handling compared to any other brand. They handle any kind of motion the best, without creating a heavy "soap-opera" effect.
Hardcore enthusiasts and profesionalists like me will cry about anything that is slightly different then the creators intent. We will literally scream in pain if you dont use custom picture mode on any Sony TV and if you dont have all picture processing features turned OFF.
This being said, its your TV.
And this message is for everyone:
Dont listen to Hardcore enthusiasts. Ignore us. Just enjoy your TV the way you want. Its your TV after all. If you like bright and punchy colors, use Vivid. If you want the best possible image, play around with the settings until you are satisfied, not what others tell you what the best image is. Everyone has different taste. Some like punchy images, others hate it. Never listen to much to "experts".