In most cases, I would say using 16+/44.1 is even preferred over higher sample rates for a number of practical reasons depending on other electronics in your system, but that is a more complicated topic. As others have stated, the spatial perception of sound or other feelings like definition and depth are provided by the content of the music itself and your speakers/room interaction, not a dac or these other electronics. Around here, "neutral/flat" is generally considered good because it is truer to the source, but if you don't like that sound, it feels "off" or you're expecting something else, this is tackled in other ways with DSP/EQ, changing your speakers, adding subwoofers, or changing/modifying things like your room or listening distances. The only way to really know for sure in some meaningful way is doing some kind of measurements of your system with a calibrated microphone ($80) and then changing certain aspects of your system or room with a goal in mind, for example to either be more objectively neutral or more subjectively better sounding to your tastes (perhaps you enjoy a warmer sound with more bass than "neutral"). The easiest way you can do is is playing around with EQ, which is free. Buying a better dac for HiRes content will certainly not change your acoustic experience in any meaningful way, I can assure you, but it is still nice to have one if you have money burning a hole in your pocket (money better spent upgrading things like speakers, subwoofers, room treatments etc..).