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SUHD is really more of a marketing term, denoting their premium line up, it is a better quality lcd panel with more colors and has hdr and dolbyvision, and a higher refresh rate and smoother processing.
The black levels are not going to be significantly better on a suhd.
Lower contrast and weak black levels are inherent to all lcd based tvs like this. To truly improve on that you'd either need an old and obsolete plasma, or a new OLED. I'd go with an OLED over a "suhd" model, but the cost difference is another order higher than between uhd and suhd: http://amzn.to/2gAbvhY
I would not expect a big difference going to a suhd, if anything I'd put my money into getting a bigger tv instead. At that distance, you'd benefit more from a 70 or 75 inch screen than you would from deeper blacks.
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