AFAIK battery life and autofocus speed (tracking moving objects etc) are the only areas where DSLRs really still have an advantage over mirrorless, for everything else a mirrorless with equivalent sensor is on the same level now while being smaller and lighter.
Haven't had one myself, just a quick play with an Olympus which seemed nice enough but I know a couple of professional landscape photographers that use the Sony A7r and rate it.
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