Sony made some of the first CRT HDTVs (which cannot accept 720p natively) with decent 720p->1080i conversion. Many CRT HDTVs that do this convert 1080i to 480p, which looks pretty awful.
However, in the battle to make truly cheap RP CRT HDTVs (which constituted the low end of the market for a while), Sony did make some that don't accept 720p at all I believe.
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Sony made some of the first CRT HDTVs (which cannot accept 720p natively) with decent 720p->1080i conversion. Many CRT HDTVs that do this convert 1080i to 480p, which looks pretty awful.
However, in the battle to make truly cheap RP CRT HDTVs (which constituted the low end of the market for a while), Sony did make some that don't accept 720p at all I believe.